This UHF FM Transmitter is hidden in a common pen, and it can transmitt the voice to a distance up to 1000 m in open field.
In order to receive the FM signal, you must use a FM scanner or a transceiver.
This pen has a dicreet power switch, which enables you to turn it on/off whenever you need.
It has inside rechargeable batteries, so you don't have to open it and change anything.
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