Instructions for Sentry HO700 Wireless Headphones

by Nicole Fotheringham
Comstock/Comstock/Getty Images

Sentry HO700 Dynamic Wireless Headphones and Transmitter allows you to listen to music, radio and video from up to 50 feet away from the device. The headphones have no wires to get tangled if you wish to move around while listening to your favorite tunes. You can plug the headphones into any device such as a TV, MP3 player, stereo or computer. It even has a built in FM radio.

Step 1

Remove the battery bay cover on the side of the base and insert the 9V battery. Use the diagram on the base to determine battery orientation. Use a small flathead screwdriver to remove the battery bay cover on the headphones. The battery bay cover is on the outside of one of the headphones. Install the AAA batteries and replace the cover.

Step 2

Plug the base into the audio output socket on your audio device such as a radio, computer MP3, stereo or any device with a 1/8 inch audio jack. Make sure that the device is on and playing and that the volume is set to a reasonable level.

Step 3

Extend the transmitter's antennae. Press the "ON' button on both the base and one side of the headphones. Ensure that the power light on both components is illuminated.

Adjust the volume control on the other headphone to the desired level.


  • Buy an optional AC/DC adapter for the transmitter. Plug the adapter into the wall socket and into the adapter cradle. Place the transmitter into the adapter cradle.


Photo Credits

  • Comstock/Comstock/Getty Images

About the Author

Nicole Fotheringham has been a writer since 1997. She was born in South Africa and began as a reporter for the "Natal Mercury" and "Cape Argus" newspapers. Fotheringham has a master's degree in English literature from the University of KwaZulu-Natal.

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