Covert Audio Transmitter Bug
So you would like to record audio covertly without raising any suspicion? This Covert Audio Transmitter Bug is worth a look. It is a miniature UHF transmitter that measures 15mm in diameter. It has an operating band frequency of 400-470Mhz.
The bug can transmit audio over up to 650 feet, depending on the environment. You can find out more about it here.
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