| Our Thanks, The CB Story,   and Customer Assistance   Introduction   Thank you for purchasing the Cobra 19 DX IV CB Radio   Transceiver. Properly used, this Cobra product will give   you many years of reliable service.   The Citizens Band Story   The Citizens Band lies between the shortwave broadcast and 10-meter amateur radio   bands, and was established by law in 1949. The Class D two-way communications   service was opened in 1959. (CB also includes a Class A citizens band and Class C   remote control frequencies.)   Owner’s Manual   Customer Assistance   The Cobra line of quality products includes:   Customer Assistance   Should you encounter any problems with this product, or not understand   its many features, please refer to this owner’s manual. If you require further   assistance after reading this manual, Cobra Electronics offers the following   customer assistance services:   CB Radios   microTALK® Radios   For Assistance in the U.S.A.   Automated Help Desk English only.   Radar/Laser Detectors   Safety Alert® Traffic Warning Systems   Handheld GPS Receivers   Mobile GPS Navigation Systems   HighGear® Accessories   CobraMarine™ VHF Radios   Power Inverters   24 hours a day, 7 days a week 773-889-3087 (phone).   Customer Assistance Operators English and Spanish.   8:00 a.m. to 6:00 p.m. CT Mon. through Fri. (except holidays) 773-889-3087 (phone).   Questions English and Spanish.   Faxes can be received at 773-622-2269 (fax).   Technical Assistance English only.   English and Spanish. [email protected] (e-mail).   For Assistance Outside the U.S.A.   Contact Your Local Dealer   Accessories   For more information or to   order any of our products,   please visit our website:   MOBILE RADIO   Printed in China   Part No. 480-170-P   Version A   ©2005 Cobra® Electronics Corporation   6500 West Cortland Street   Chicago, Illinois 60707 USA   19 DX IV   Nothing comes close to a Cobra®   Nothing comes close to a Cobra®   English   English   A1   English   Download from Www.Somanuals.com. All Manuals Search And Download.   Contents   Introduction   Introduction   Our Thanks to You . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1   The Citizens Band Story . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1   Customer Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1   Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2   FCC Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3   Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2   Included in this Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2   Installation and Start-Up   Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3   Operating Your Mobile Radio   Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4   Antenna Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4   External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4   Public Address (PA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4   Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4   Turning on Your Mobile Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5   CB Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5   Microphone Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5   Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6   RF Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6   Selecting a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7   Channel 9/NOR/Channel 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7   CB/PA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7   S/RF Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7   TX Indicator LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7   Ignition Noise Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8   Temporary Mobile Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8   Operating Procedure to Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9   Operating Procedure to Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . 9   Maintenance/Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10   Frequency Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11   Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12   Warranty   Limited One-Year Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13   Customer Assistance   Product Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14   Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16   Order Form and Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . 17   Nothing comes close to a Cobra®   1 Download from Www.Somanuals.com. All Manuals Search And Download.   Warnings and   Included in this Package   Mounting and Connections   Introduction   Installationand Start-Up   Warnings   Mounting and Connections   • • Select a location for the transceiver and microphone bracket that is convenient for   operation. In automobiles, the transceiver is usually mounted to the underneath of   the dash panel, with the microphone bracket beside it.   REPLACEMENT WARNING   Replacement or substitution of certain parts with replacements other than those   recommended by Cobra may be a violation of the technical regulations of Part 95   of the FCC rules, or of Type Acceptance requirements of Part 2 of those rules.   When making adjustments, be sure to re-read applicable portions of this instruction manual   to make certain you are following correct procedure and that the radio was properly installed.   A universal mounting bracket is supplied along with self   tapping screws and star washers. The transceiver is held   in the universal mounting bracket by two thumb screws,   permitting adjustment at the most convenient angle.   Transceiver Bracket   A FEW RULES THAT SHOULD BE OBEYED   1. You are not allowed to carry on a conversation with another station for more than five minutes   at a time without taking a one-minute break to give others a chance to use the channel.   2. You are not allowed to blast others off the air by overpowering them with illegally   amplified transmitter power or illegally high antennas.   3. You are not allowed to use CB to promote illegal activities.   4. You are not allowed to use profanity.   5. You may not play music in your CB.   To mount and connect your transceiver:   CB Tranceiver   1. Hold the radio with mounting bracket in the exact   location desired. Remove the mounting bracket   and use it as a template to mark the location for   the mounting screws.   2. Drill necessary holes and secure mounting   bracket in location.   3. Connect the antenna cable plug to the receptacle   marked “ANT” on the back of the unit.   4. Connect the red lead of the DC power cord   to an accessory 12 volt fuse.   Antenna Connector   6. You may not use your CB to sell merchandise or professional service.   CHANNEL 9 EMERGENCY MESSAGES   Use Channel 9 for emergency messages only. The FCC gives the following examples   of permitted and prohibited types of communications for use on Channel 9. These are   guidelines and are not intended to be all-inclusive.   Permitted: “A tornado sighted six miles of town.”   Not Permitted: “This is observation post number 10. No tornado sighted.”   Fuse Connection   5. Connect the black lead to the negative side   of the automobile. This is usually the chassis.   Any convenient location with good electrical   contact (remove paint) may be used.   Included in this Package   NOTE   • Before installing the CB radio, visually check the   vehicle battery connections to determine which   battery terminal, positive or negative (positive is   the larger of the two) is grounded to the engine   block (or chassis).   You should find all of the following items in this package:   CB Transceiver   Microphone   Transceiver Bracket   Microphone Connector   6. Mount the microphone bracket on right side   of the transceiver or near it using two screws   supplied. When mounting in an automobile,   place the bracket under the dash so the   microphone is readily accessible.   Microphone Bracket   Operating Manual   7. Attach the four pin microphone cable to receptacle   on front of unit and install unit in bracket securely.   2 Nothing comes close to a Cobra®   3 English   Download from Www.Somanuals.com. All Manuals Search And Download.   Operation   Operation   Operating Your Mobile Radio   Operation   Operating Your Mobile Radio   Operation   • • Antenna Connector   Turning on Your Mobile Radio   Antenna Connector   On-Off/Volume Knob   This female Connector on the rear panel permits   connection of the transmission line cable male   connector to the transceiver.   Turn the On-Off/Volume knob clockwise to turn   the power on and set the desired listening volume.   CB Antenna   External Speaker   Only a properly matched Antenna system will   allow maximum power output. In mobile installations   (cars, trucks, boats, etc.), an Antenna system that is   non-directional should be used. When installed in a   boat, the transceiver will not operate at maximum   efficiency without a ground plate unless the vessel   has a steel hull. Before installing the transceiver   in a boat, consult your dealer for information   regarding an adequate grounding system.   The external speaker jack on the rear panel is used   for an External Speaker. The external speaker should   have 8-ohm impedance and be rated to handle at   least 4.0 watts. When the external speaker is plugged   in, the internal speaker is automatically disconnected.   External Speaker Jack   PA Speaker Jack   Power Cable   NOTE   Cobra external speakers are rated 15 watts.   Public Address (PA)   NOTE   Cobra loaded-type antenna models HGA 1000,   An external PA speaker may be connected   to the PA speaker jack when used as a public   address system. The speaker should be directed   away from the microphone to prevent acoustic   feed-back. Physical separation or isolation of   the microphone and speaker must be employed   when operating the PA at high output levels.   HGA 1500 and HGA 2000 are highly recommended   for most installations. Consult your Cobra dealer   for further details (or see order form on page 17).   Three-way combination antennas are available   which allow operation of all three bands (AM-FM   and CB), using a single antenna. However, use   of this type of antenna usually results in less   than normal transmit and receive range when   compared to a standard-type “Single Band”   antenna designed for CB only.   Power   These wires supply Power to the CB radio.   This cable is permanently attached to the radio.   If you wish to remove the radio after installation,   disconnect at fuse holder and ground connector.   Microphone Connector   Microphone Connector   Allows for convenient removal of the Microphone plug   when storage is required. The Microphone MUST be   connected to the unit at all times, when in use, for   proper operation.   4 Nothing comes close to a Cobra®   5 English   Download from Www.Somanuals.com. All Manuals Search And Download.   Operation   Operation   Operating Your Mobile Radio   Operation   Squelch   Operating Your Mobile Radio   Operation   • • Selecting a Channel   Channel Selector Knob   This control is used to cut off or eliminate receiver background noise in the absence   of an incoming signal. Adjust until the receiver noise disappears. This will require the   incoming signal to be slightly stronger than average receiver noise. Further clockwise   rotation will increase the threshold level which a signal must overcome in order to be   heard. Only strong signals will be heard at a maximum clockwise setting.   Rotate the Channel knob clockwise   until desired channel is displayed.   Squelch is the “control gate” for incoming signals.   To squelch your radio:   1. Full clockwise rotation closes the gate,   allowing only very strong signals to enter.   2. Full counterclockwise rotation opens   the “gate,” allowing all signals in.   Adjust Squelch/RF Gain Knob   Channel 9/NOR/Channel 19   Set CH 9 to obtain instant access   to the emergency channel.   Set NOR position to use the channel knob   to choose any of the 40 channels.   Channel 9/NOR/Channel 19 Button   3. To achieve the Desired Squelch Setting (DSS),   turn the Squelch control counterclockwise until   you hear noise. Now turn the control clockwise   just until the noise stops. This is the DSS setting.   Set CH 19 to obtain instant access to   the information and calling channel.   CB/PA Button   CB/PA   In the CB position, the PA function is disabled   and the unit will transmit and receive on the   selected channel. The PA function should not   be used unless a PA speaker is connected. In the   PA position, the transmit function is disabled and   the microphone output will go only to the PA speaker.   Gate Open   Desired Squelch Setting (DSS)   Gate Closed   Strong Signals   Medium Signals   Weak Signals   Noise   Strong Signals   Medium Signals   Weak Signals   Noise   Strong Signals   Medium Signals   Weak Signals   Noise   S/RF Power Meter   S/RF Power Meter   RF Gain   Shows relative transmitter RF output power   and input signal strength when receiving.   The Liquid Crystal Display (LCD) segments   increase with signal strength.   This control is used to adjust receiver sensitivity. Maximum sensitivity allows   weak signals to be received. However, very strong signals (such as from a nearby   transmitter) can cause distortion at that setting. Adjust until the distortion disappears.   Reducing the receiver’s RF Gain eliminates distortion from very strong incoming signals.   To set RF Gain:   1. Full counterclockwise rotation minimizes   gain for maximum distortion control.   2. To achieve the desired level of distortion control,   turn the RF Gain knob counterclockwise until   the distortion is eliminated.   Adjust Squelch/RF Gain Knob   TX Indicator   TX Indicator   The TX Indicator will light when in the   transmit mode. “Busy” will appear when   there is an incoming signal.   3. After moving away from the strong signal,   turn the RF Gain knob fully clockwise to   receive all possible signals.   6 Nothing comes close to a Cobra®   7 English   Download from Www.Somanuals.com. All Manuals Search And Download.   Operation   Operation   Operating Your Mobile Radio   Operating Your Mobile Radio   Operation   Operation   • • Ignition Noise Interference   Operating Procedure to Receive   On-Off/Volume Knob   Use of a mobile receiver at low signal levels is normally limited by the presence   of electrical noise. Under most operating conditions, when signal level is adequate,   the background noise does not present a serious problem. Also, when extremely   low level signals are being received, the transceiver may be operated with vehicle   engine turned off. The unit requires very little current and therefore will not   significantly discharge the vehicle battery.   Even though this radio has an automatic noise limiter, in some installations   ignition interference may be high enough to make good communications   impossible. Consult your authorized Cobra dealer or a two-way radio technician   for help in locating and correcting the source of severe noise.   Be sure that power cord, antenna and microphone   are connected to the proper connectors before   proceeding further. The CB/PA switch should be   in the CB position.   To receive:   1. Turn the radio on by rotating the   On-Off/Volume knob clockwise.   2. Rotate the Squelch/RF Gain knob   counterclockwise until incoming   signal is heard.   Adjust Squelch/RF Gain Knob   3. Select the desired channel.   Temporary Mobile Operation   4. Set the On-Off/Volume knob and the   Squelch/RF Gain knob to a comfortable   listening level.   For Temporary Mobile Operation, you may want to purchase an additional cigarette   lighter adapter from your Cobra dealer. This adapter and a magnetic mount antenna   allow you to quickly “install” your transceiver for temporary use.   Temporary Mobile Operation   NOTE   Operating Procedure to Transmit   Red Wire is connected to positive side   Be sure the antenna is properly connected to the radio before transmitting.   Prolonged transmitting without an antenna, or with a poorly matched   antenna, could cause damage to the transmitter.   PA   EXT   ANT   of socket center tip. Black Wire is connected   to negative side contacts.   13.8V DC   Radio resets to CH 9 when connected to   cigarette lighter plug.   When using the unit with cigarette adapter,   turn off when not in use to avoid draining   the battery.   To transmit:   1. Select the desired channel.   Press-to-Talk Switch   2. The receiver and transmitter are controlled by   the Press-to-Talk switch on the microphone.   Press the switch and the transmitter is activated;   release switch to receive. When transmitting   (on a clear channel), hold the microphone   two inches from the mouth and speak clearly   in a normal voice.   8 Nothing comes close to a Cobra®   9 English   Download from Www.Somanuals.com. All Manuals Search And Download.   Maintenance/Adjustment   Frequency Ranges   Operating Your Mobile Radio   Operating Your MobileRadio   Maintenance/Adjustment   Frequency Ranges   • • Your Cobra CB transceiver is specifically designed for the environment encountered   in mobile installations. The use of all solid state circuitry and its light weight result   in high reliability. Should a failure occur, however, review the following, then if   necessary, replace parts only with identical parts. Do not substitute.   The Cobra 19 DX IV transceiver represents one of the most advanced AM   two-way radios for use as a Class D station in the Citizens Radio Service.   This unit features advanced Phase Lock Loop (PLL) circuitry providing   complete coverage of all 40 CB channels.   1. Check connections to the source of power   Check Power Source   and make sure it is the 13.8 VDC required   to operate your radio.   CB   Channel   Channel Frequency   in MHz   CB   Channel   Channel Frequency   in MHz   2. Check the fuses in the DC power cord.   The main power lead (red) has a two amp   3AG type fuse in its holder. Use only the   above specified type and size fuse for   maximum protection. Failure to do so   1 2 26.965   26.975   26.985   27.005   27.015   27.025   27.035   27.055   27.065   27.075   27.085   27.105   27.115   27.125   27.135   27.155   27.165   27.175   27.185   27.205   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   27.215   27.225   27.255   27.235   27.245   27.265   27.275   27.285   27.295   27.305   27.315   27.325   27.335   27.345   27.355   27.365   27.375   27.385   27.395   27.405   3 4 Check Fuses in DC Power Cord   will void the warranty.   5 3. Make certain the microphone is properly   plugged in.   4. Make certain the antenna is properly   assembled and connected.   If you are unable to correct the problem,   refer to product service on page 14 for   the correct procedure for warranty and   post-warranty service from Cobra.   6 7 8 9 10   11   12   13   14   15   16   17   18   19   20   Check Microphone Connection   Check Antenna Connection   10   Nothing comes close to a Cobra® 11   English   Download from Www.Somanuals.com. All Manuals Search And Download.   Warranty and Trademark   Acknowledgement   Specifications   Operating Your Mobile Radio   Warranty   Specifications   Limited One-Year Warranty   • • For Products Purchased in the U.S.A.   General   Channels   Cobra Electronics Corporation warrants that its Cobra CB radios, and the component   parts thereof, will be free of defects in workmanship and materials for a period of   one year from the date of first consumer purchase. This warranty may be enforced   by the first consumer purchaser, provided that the product is utilized within the U.S.A.   Cobra will, without charge, repair or replace, at its option, defective CB radios,   products or component parts upon delivery to the Cobra Factory Service department,   accompanied by proof of the date of first consumer purchase, such as a duplicated   copy of a sales receipt.   CB – 40 CH   Frequency Range   Frequency Tolerance   Frequency Control   Operating Temperature Range   Microphone   CB – 26.965 to 27.405 MHZ   0.005 %   PLL (Phase Lock Loop) Synthesizer   -30° C TO + 65° C   Plug-in dynamic   Input Voltage   13.8VDC nom. (negative ground)   You must pay any initial shipping charges required to ship the product for warranty   service, but the return charges will be at Cobra’s expense, if the product is repaired   or replaced under warranty.   This warranty gives you specific legal rights, and you may also have other rights   which may vary from state to state.   Exclusions: This limited warranty does not apply: 1) To any product damaged   by accident; 2) In the event of misuse or abuse of the product or as a result of   unauthorized alterations or repairs; 3) If the serial number has been altered,   defaced or removed; 4) If the owner of the product resides outside the U.S.A.   All implied warranties, including warranties of merchantability and fitness for a   particular purpose are limited in duration to the length of this warranty. Cobra   shall not be liable for any incidental, consequential or other damages; including,   without limitation, damages resulting from loss of use or cost of installation.   Current Drain   Transmit: AM full mod., 1.4A (maximum)   Receive: Squelched, 0.9 A;   full audio output, 1.2A (nominal)   7 3 7 Size   6 ⁄8" D x 6 ⁄4" W x 1 ⁄8" H   3.25 lbs.   Weight   Antenna Connector   Meter   UHF; SO-239   LCD’s; indicates relative power   output and received signal strength   Transmitter   Power Output   4 watts   Modulation   AM (Amplitude Modulation)   300 to 3000 Hz   Some states do not allow limitations on how long an implied warranty lasts and/or   do not allow the exclusion or limitation of incidental or consequential damages,   so the above limitations may not apply to you.   Frequency Response   Output Impedance   50 ohms, unbalanced   For Products Purchased Outside the U.S.A.   Please contact your local dealer for warranty information.   Receiver   Sensitivity   Less than 1 µV for 10dB (S+N)   6 dB @ 7 KHz, 60 dB @ 10KHz   60 dB, typical   Selectivity   Trademark Acknowledgement   • Cobra®, Nothing comes close to a Cobra® and the snake design are registered   trademarks of Cobra Electronics Corporation, USA. Cobra Electronics Corporation™   is a trademark of Cobra Electronics Corporation, USA.   Image Rejection   Adjacent-Channel Rejection   Automatic Noise Limiter   50 dB, typical   Built-in   12   Nothing comes close to a Cobra® 13   English   Download from Www.Somanuals.com. All Manuals Search And Download.   Product Service   Product Service   Customer Assistance   Customer Assistance   Product Service   For Products Purchased in Canada   • For out of warranty service, ship prepaid this product to: AVS Technologies Inc.,   2100 Trans Canada Hwy S., Montreal, Quebec, H9P 2N4. We reserve the right to   repair or replace the radio with an equivalent product. Please include the following   information: Date of Purchase, Model Number, Dealer Purchased From,   Dealer Address, Dealer Phone Number.   If you have any questions about operation or installing your new   Cobra product, or if you are missing parts…   Please call Cobra first! DO NOT RETURN THIS PRODUCT TO THE STORE!   See customer assistance on page A1.   For Products Purchased in the U.S.A.   For Products Used in Canada   Industry Canada Notice   Operation is subject to the following two conditions: 1) this device may not cause   interference, and 2) this device must accept any interference, including interference   that may cause undesired operation of this device.   If your product should require factory service, please call Cobra first before sending   your radio. This will ensure the fastest turn-around time on your repair. You may be   asked to send your radio to the Cobra factory. It will be necessary to furnish the   following to have the product serviced and returned.   1. For warranty repair include some form of proof-of-purchase, such as a mechanical   reproduction or carbon of a sales receipt. If you send the original receipt, it cannot   be returned.   For Products Purchased Outside the U.S.A. or Canada   Please contact your local dealer for product service information.   2. Send the entire product.   3. Enclose a description of what is happening with the radio. Include a typed   or clearly printed name and address of where the radio is to be returned.   4. Pack radio securely to prevent damage in transit. If possible, use the original   packing material.   5. Ship prepaid and insured by way of a traceable carrier such as   United Parcel Service (UPS) or Priority Mail to avoid loss in   transit to Cobra Factory Service, Cobra Electronics Corporation,   6500 West Cortland Street, Chicago, Illinois 60707 U.S.A.   6. If the radio is in warranty, upon receipt of your radio it will either be   repaired or exchanged depending on the model.   Please allow approximately three to four weeks before contacting Cobra   for status. If the radio is out of warranty, a letter will automatically be sent informing   you of the repair charge or replacement charge. If you have any questions, please   call 773-889-3087 for assistance.   14   Nothing comes close to a Cobra® 15   English   Download from Www.Somanuals.com. All Manuals Search And Download.   Accessories   Customer Assistance   Accessories   Replacement   Microphone Bracket   • Replacement   Mounting Bracket   Replacement   Thumb Screws   251-353-9-001   $4.50   741-080-9-001   $0.45   $74.95   $19.95   634-081-9-001   $0.60   Four Pin Premium   Noise-Cancelling Microphone   Four Pin Premium Noise-   Cancelling Microphone   HG M84W   Wood Grain   $74.95   HG M84   Four Pin Replacement   Dynamic Microphone   Four Pin Noise Canceling   Microphone   Four Pin Power   Microphone   HG M73   HG M77   $30.95 HG M75   $25.95   $99.95   $32.95   21" Base Loaded Magnet   Mount Antenna   38" Base Loaded Magnet   Mount Antenna   54" Base Loaded Magnet   Mount Antenna   HG A1000   $28.95 HG A1500   $46.95   HG A2000   Dynamic   External Speaker   Noise Canceling   External Speaker   Noise Canceling With   Talk Back External Speaker   HG S100   English   $21.95 HG S300   $28.95 HG S500   16   Download from Www.Somanuals.com. 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