It's a directional microphone, came with a set of headphones. Sweep the area and listen for the loudest direction, then start walking/hunting. I'm glad I didn't leave the battery in it to leak and corrode everything.
I think it uses a radio transmitter and receiver. Very limited range.
https://www.amazon.com/Transroc-002237-Transmitting-Rocket-Locator/dp/B005DBAUDS
Transroc II.
They occasionally pop up on eBay.
I think it uses a radio transmitter and receiver. CB band, I believe. Very limited range.
https://www.amazon.com/Transroc-002237-Transmitting-Rocket-Locator/dp/B005DBAUDS
The sonic beacon worked fine, never could quite get the directional microphone to guide me to the rocket.
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