Sentry ZX500 Instruction Manual
DYNAMIC
WIRELESS HEADPHONE
MODEL ZX500
Congratulations on your purchase of these Sentry ZX500 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.
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.
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.
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.
Transmitter:
• Operational Frequency: 49.85MHz
• Power Supply: 9V Battery/Optional UL Listed 12V 200 mA 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
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.
Technical Specifications:
Limited Ninety-Day Warranty:
Over 40 Years of Excellence in Electronics.
Visit us online at www.SentryIndustries.com
Important Safety Instructions:
Battery Installation:
What’s Included:
Transmitter Controls:
Headset Controls:
1) Headset Receiver
2) Transmitter
3) RCA to Phono Plug Adapter
4) Stereo Mini-Plug Adapter
5) Hi-Fi Stereo Adapter
Transmitter:
1) Audio Input Jack
2) AC/DC Jack
3) Telescopic Antenna
4) LED Power Indicator
5) ON/OFF Button
6) Battery Compartment
Headset Receiver:
1) ON Button
2) OFF Button
3) Volume Control Dial
4) LED Power Indicator
5) Battery Compartment
6) Battery Compartment Latch
• To avoid injury to ears and stereo player, lower volume before plugging headphones into device.
• It is not advisable to listen to headphones while cycling, driving a vehicle or operating machinery.
• Avoid listening for prolonged periods at high volume which may damage hearing.
Transmitter:
1. Open up the battery compartment on the transmitter and insert one ‘9V’ battery.
2. Replace the cover to the transmitter’s battery compar tment by sliding it back on.
Headphone:
1. Open the battery compartment by sliding the latch downward.
2. Put in two 'AAA' batteries. Make sure they are placed in the compartment with the polarity
in the correct position (+/-).
3. Close the compartment by sliding the cover back on & closing the latch.
Using the Optional 12V Power Adapter:
The Transmitter can also be powered by an optional 12V Power Adapter. AC/DC Adapters are
sold separately and are available at most home electronics retailers or department stores. To
use the Power Adapter:
1. Place the Transmitter in the supplied Cradle.
2. Connect the Power Adapter to the transmitter’s Cradle.
3. Plug the Power Adapter into a nearby electrical outlet.
NOTE: Make sure the Power Adapter is the correct voltage and polarity as indicated on the
cradle. Failure to do so may cause damage to the transmitter.
If Something Doesn’t Sound Right:
If you experience static, distortion, or signal loss while listening to the Headphones:
1. Refer to the QUICK-START GUIDE and verify that all of your connections are correct.
2. Make sure that all connections are secure.
3. Make sure the Transmitter is connected to the “Audio-Out” jacks of the source device.
4. Replace the batteries in either the Headset or the Transmitter.
5. Make sure that the source audio device is turned on and set to a reasonable volume.
6. Ensure that you are within approximately 100 feet of the Transmitter.
Plugging In and Turning On:
Please refer to the QUICK-START GUIDE included with this product for detailed instructions
on connecting the Transmitter to most commonly used audio devices.
1. Connect the Transmitter to the “Audio-Out” jacks of your audio device using the supplied
cables and adapters. (NOTE: When connecting the Transmitter to a Television, the RCA
“Audio-Out” jacks are located on the back of your TV Set, not the fr
ont
).
2. Make sure that your audio device is turned on and set to a reasonable listening volume.
3. Fully extend the Transmitter’s Telescopic Antenna.
4. Turn the Transmitter on by pressing the “On Button” located on front of the Transmitter.
5. Turn the Headset on by pressing the “On Button” located on the side of the Headset.
6. Adjust the listening volume to a comfortable level using the Headset’s Volume Control Dial.
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