... 3. Beep detection, 4 LED display detection, 5. Headset 5) Low-voltage prompts, built-in rechargeable battery. 6) ... 10) Detect more covert videotaping 5.8GHz wireless camera, wireless eavesdropping devices, wireless monitor the signal 11) Check hotels, ... toilets, entertainment venues, changing rooms, anti-wireless pinhole camera 12) Business negotiations, school examiner places, factories ...