33-1185.fm Page 1 Wednesday, November 10, 1999 10:29 AM
Cat. No. 33-1185
OWNER’S MANUAL
Please read before using this equipment.
Rechargeable 900 MHz
Wireless Stereo
Headphones
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CONTENTS
Preparation .............................................................................................................. 4
Connecting to an Audio Source .......................................................................... 4
Using AC Power ................................................................................................. 4
Installing Batteries .............................................................................................. 5
Charging Rechargeable Batteries ................................................................ 6
Operation ................................................................................................................. 7
Listening Safely .................................................................................................. 7
Using Your Headphones .................................................................................... 7
Adjusting the Frequency ..................................................................................... 8
Troubleshooting ...................................................................................................... 9
Care and Maintenance .......................................................................................... 10
Specifications ....................................................................................................... 11
3
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PREPARATION
1
4
Note: To connect a Y-adapter to a / -
CONNECTING TO AN
AUDIO SOURCE
inch headphone jack, slip the supplied
1
1
4
8
/ -inch adapter plug over the / -inch
plug and complete the connections.
Caution: Do not connect the transmitter
to the audio source's speaker output.
Doing so could damage the transmitter
and audio source.
To connect the transmitter to your audio
source's audio output jacks, connect
one end of the supplied stereo audio ca-
ble to the transmitter's R/AUDIO IN and
R/AUDIO IN jacks (red plug to R/AUDIO
IN and white plug to L/AUDIO IN). Then
plug the other ends into the audio
source's audio output jacks (red plug to
the right channel and white plug to the
left channel).
Connect the transmitter to your audio
source's stereo headphone jack or to
separate left and right audio output jacks
(if available). If you connect the transmit-
ter to audio output jacks, you can use
the headphones’ volume control to ad-
just the volume without turning up the
volume on your audio source.
To connect the transmitter to your audio
source's stereo headphone jack, plug
1
8
the single ( / -inch) end of the supplied Y
adapter cable into the headphone jack
and connect the other ends into the sup-
plied stereo audio cable (red plug to red
jack and white plug to white jack). Then
connect the red plug to transmitter's R/
AUDIO IN jack and connect the white
plug to the L/AUDIO IN jack.
USING AC POWER
Use the supplied 12-volt, 100-mA AC
adapter to connect the transmitter to AC
power.
4
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33-1185.fm Page 5 Wednesday, November 10, 1999 10:29 AM
Cautions:
INSTALLING BATTERIES
You must use a Class 2
power source that supplies
To power the headphones’ receiver, use
the three supplied AAA nickel-cadmium
rechargeable batteries. Or, you can use
three AAA alkaline batteries (not sup-
plied, available at your local RadioShack
store).
!
12 volts DC and delivers at
least 100 mA. Its center tip must be
set to positive and its plug must fit
the transmitter's DC 12V jack. The
supplied adapter meets these speci-
fications. Using an adapter that
does not meet these specifications
could damage the transmitter or the
adapter.
Cautions:
• Use only fresh batteries of the
required size and recommended
type.
• Always connect the AC adapter to
the transmitter before you connect it
to AC power. When you finish, dis-
connect the adapter from AC power
before you disconnect it from the
transmitter.
• Do not mix old and new batteries,
different types of rechargeable bat-
teries, or rechargeable batteries of
different capacities.
Follow these steps to install batteries.
Plug the supplied AC adapter’s barrel
plug into the transmitter’s DC 12V jack,
then plug the adapter into a standard AC
outlet.
1. Remove the battery compartment
cover on the left earpiece by push-
ing up the tab and pulling the cover
up in the direction of the arrow.
2. Place the batteries over the ribbon
in the compartment, as indicated by
the polarity symbols (+ and –) in the
illustration.
3. Replace the cover.
5
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33-1185.fm Page 6 Wednesday, November 10, 1999 10:29 AM
When the headphones stop operating
properly, replace or recharge the batter-
ies.
Charging Rechargeable
Batteries
Before using your headphones for the
first time, you must charge the head-
phones’ batteries for at least 24 hours. If
the headphones' range decreases or
you hear no sound from the audio
source, recharge the batteries. It takes
12 to 14 hours to completely recharge
the batteries.
Warnings:
• Do not dispose of the batteries in a
fire because they can explode.
• Do not open or mutilate a battery.
Swallowing a battery can be fatal.
• Be careful not to short the batteries
with conducting materials, such as
rings, bracelets, and keys. The bat-
teries or the conductor might over-
heat and burn.
Follow these steps to charge the batter-
ies.
1. If necessary, press the headphones'
POWER ON/OFF button to turn off
the headphones.
• Do not attempt to charge alkaline
batteries.
Note: You cannot charge the batter-
ies with the headphones turned on.
Caution: When you replace the batter-
ies, use replacement batteries of the re-
quired type (AAA), available through
your local RadioShack store.
2. Plug the supplied charging cable
into the headphones' CHARGE jack
on the left earpiece.
Important: This product
can use nickel-cadmium
rechargeable batteries.
At the end of a nickel-
cadmium battery's useful
life, it must be recycled or
disposed of properly. Contact your local,
county, or state hazardous waste man-
agement authorities for information on
recycling or disposal programs in your
area or call 1-800-843-7422. Some op-
tions that might be available are: munici-
pal curbside collection, drop-off boxes at
retailers such as your local RadioShack
store, recycling collection centers, and
mail-back programs.
3. Plug the other end of the charging
cable into the transmitter base's
CHARGE jack. The indicator beside
the jack lights.
0
0
8
3
4
4. When charging is complete, unplug
the charging cable. The indicator
turns off.
6
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33-1185.fm Page 7 Wednesday, November 10, 1999 10:29 AM
OPERATION
flash, rotate LEVEL clockwise until
the indicator flashes.
LISTENING SAFELY
To protect your hearing, follow these
guidelines when you use headphones.
• Set the volume to the lowest setting
before you begin listening. After you
begin listening, adjust the volume to
a comfortable level.
• Do not listen at extremely high vol-
ume levels. Extended high-volume
listening can lead to permanent
hearing loss.
If you connected the transmitter to
an audio source's line output jack
(or a jack that is not controlled by
the audio source's volume control),
rotate VOL on the headphones fully
counterclockwise, then rotate LEVEL
until the indicator flashes rapidly or
remains lit.
• Once you set the volume, do not
increase it. Over time, your ears
adapt to the volume level, so a vol-
ume level that does not cause dis-
comfort might still damage your
hearing.
Note: Some audio sources might
not make the indicator flash. For
these sources, rotate LEVEL all the
way to the left.
USING YOUR
HEADPHONES
3. Press the head-
phones'
POWER
ON/OFF button to
1. Turn on the audio source.
turn on the head-
phones.
The
Note: If connecting headphones
does not automatically disable the
audio source’s speakers, turn off the
speakers.
POWER indicator
on the left earpiece
lights.
2. If you connected the transmitter to
an audio source's headphone jack
(or a jack that is controlled by the
audio source's volume control), set
LEVEL on the back of the transmitter
about midway, then rotate the audio
source's volume control until the
indicator at the front of the transmit-
ter flashes. If the indicator does not
4. Rotate TUNE until
the STEREO indi-
cator on the right
earpiece lights.
5. Put on the head-
phones and adjust
VOL on the right
earpiece to the
desired
level.
listening
7
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33-1185.fm Page 8 Wednesday, November 10, 1999 10:29 AM
6. To turn off the headphones, take off
the headphones, then press the
POWER ON/OFF button.
ADJUSTING THE
FREQUENCY
If you receive interference from other
devices, you might be able to reduce the
interference by adjusting your head-
phones’ operating frequency.
To preserve battery life, be sure to turn
off the headphones when you are not
using them.
Notes:
Simply rotate FREQ ADJUST on the
transmitter then rotate TUNE on the right
earpiece until the STEREO indicator
lights steadily.
• The STEREO indicator on the right
earpiece lights when the head-
phones are receiving a clear signal.
As you move out of the transmitter's
range, the STEREO indicator turns
off. You still can hear the audio
source in mono until you move com-
pletely out of range.
• If reception is poor even when the
batteries are fully charged and you
are near the transmitter, try moving
the transmitter to a higher location
or moving it away from the audio
source.
8
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TROUBLESHOOTING
We do not expect you to have any problems with your headphones, but if you do, the
following suggestions might help.
Problem
Solution
No sound
Be sure the headphones are turned on.
Charge the headphones' batteries.
Be sure the AC adapter is plugged in and has power.
Be sure all cables are connected securely.
Be sure the audio source is turned on and tuned to an
active channel.
If you have connected the transmitter to jacks that are
controlled by the audio source's volume control, be sure
the source's volume control is turned up.
If the stereo indicator on the right earpiece is not on,
adjust
on the right earpiece until it turns on.
TUNE
Adjust the headphones' volume control.
Change the position of the transmitter.
Distorted audio
If the STEREO indicator on the right earpiece does not
light steadily, adjust
on.
on the earpiece until it turns
TUNE
Rotate
TUNE
on the transmitter, then adjust
FREQ ADJUST
on the right earpiece until the STEREO indicator
on the earpiece lights steadily.
If you connected the transmitter to an audio source’s
headphone jacks, reduce the audio source’s volume.
Charge the headphone's batteries.
Change the position of the transmitter.
Adjust the
control on the transmitter so the level
LEVEL
indicator flashes only occasionally.
If you still have problems, take the headphones to your local RadioShack store for as-
sistance.
9
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33-1185.fm Page 10 Wednesday, November 10, 1999 10:29 AM
CARE AND MAINTENANCE
Your
an ex-
RadioShack Rechargeable 900 MHz Wireless Stereo Headphones are
ample of superior design and craftsmanship. The following suggestions will help you
care for your headphones so you can enjoy it for years.
Keep the headphones dry. If they get wet, wipe them dry immediately.
Liquids might contain minerals that can corrode the electronic circuits.
Use and store the headphones only in normal temperature environ-
ments. Temperature extremes can shorten the life of electronic devices,
damage batteries, and distort or melt plastic parts.
Keep the headphones away from dust and dirt, which can cause prema-
ture wear of parts.
Handle the headphones gently and carefully. Dropping them can dam-
age circuit boards and cases and can cause the headphones to work
improperly.
Use only fresh batteries of the required size and recommended type.
Batteries can leak chemicals that damage your headphones’ electronic
parts.
Wipe the headphones with a damp cloth occasionally to keep them look-
ing new. Do not use harsh chemicals, cleaning solvents, or strong deter-
gents to clean the headphones.
Modifying or tampering with the headphones’ internal components can cause a mal-
function and might invalidate their warranty and void your FCC authorization to op-
erate them. If your headphones are not performing as they should, take they to your
local RadioShack store for assistance.
10
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33-1185.fm Page 11 Wednesday, November 10, 1999 10:29 AM
SPECIFICATIONS
Transmitter
Carrier Frequency ....................................................................... 912.25–914.75 MHz
Power Source ......................................................................... 12V DC, 100 Milliamps
Modulation Method ............................................................................. FM Modulation
Headphones
Frequency Response ........................................................................... 50 Hz –12 kHz
S/N Ratio ......................................................................................................... >55 dB
Stereo Separation ............................................................................ 20 dB or Greater
Audio Distortion ................................................................................................... <2%
Operating Range ..................................................................... 150 Feet (Open Field)
Specifications are typical; individual units might vary. Specifications are subject to
change and improvement without notice.
11
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33-1185.fm Page 12 Wednesday, November 10, 1999 10:29 AM
Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing defects in material and workman-
ship under normal use for ninety (90) days from the date of purchase from RadioShack company-
owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED
HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES,
INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES
CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABIL-
ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE-
SPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE
OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR-
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN AD-
VISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-
cidental or consequential damages, so the above limitations or exclusions may not apply to you.
In the event of a product defect during the warranty period, take the product and the RadioShack
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase
price. All replaced parts and products, and products on which a refund is made, become the prop-
erty of RadioShack. New or reconditioned parts and products may be used in the performance of
warranty service. Repaired or replaced parts and products are warranted for the remainder of the
original warranty period. You will be charged for repair or replacement of the product made after the
expiration of the warranty period.
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs
of product removal, installation, set-up service adjustment or reinstallation.
This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102
04/99
We Service What We Sell
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
11A99
Printed in Hong Kong
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