The FCC Needs You to Know:
Warning: Changes or modifications to this unit not expressly approved by the party responsible for
compliance will void the user's authority to operate the equipment. Any change to the equipment will
void FCC grant.
DYNAMIC
WIRELESS HEADPHONE
This equipment has been tested and found to comply with the limits for a Class C digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Move the transmitter to a different physical location.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
• If you cannot eliminate the interference, the FCC requires that you stop
using your headphones.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Technical Specifications:
Transmitter:
• Operational Frequency: 49.85MHz
• Power Supply: 9V Battery/Optional UL Listed 12V AC/DC Adapter
• Transmit Distance: Approximately 100 Feet
• Input Audio Signal: Max. 500 (mV)
Headphone Receiver:
• Operational Frequency 49.85MHz
• Power Supply: DC 3V (Size ‘AAA’ x 2)
• Load: 32o
• Signal/Noise Ratio: >50dB
MODEL HO900
Congratulations on your purchase of these Sentry HO900 Wireless Dynamic Headphones. Each
unit has been meticulously designed and engineered to give you years of dependable
operation. Please review this manual carefully before operating your headphones and store it in
a safe place for future reference.
Limited Ninety-Day Warranty:
Sentry warrants this product to be free from defects in materials and workmanship for a ninety day
period from the date of original purchase. This warranty does not pertain to damage resulting from
accident, abnormal use, misuse or neglect. Any defective product will be replaced if returned to an
authorized Sentry dealer or to Sentry directly at: P.O. Box 885, One Bridge St. Hillburn, NY 10931.
Please enclose your original sales receipt and a check for $5.00 for return shipping & handling.
Note: The manufacturer is not responsible for any radio or TV interference caused by unauthorized
modifications to this equipment. Such modifications could void the user's authority to operate the equipment.
Over 40 Years of Excellence in Electronics.
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