I have a similar spy detection device but it's quite bulky and draws unnecessary attention when you test it so I needed a more discreet system to take with you . This pen-sized detection works very well, and as shown in the video, the beep becomes more frequent and the LED bar rises higher as the signal gets stronger. The device is very easy to use and can detect pinhole cameras as well as other frequency emitting devices. According to the instructions, you may not always be able to detect a signal depending on the source and output intervals. This is especially true for systems that only send and receive signals intermittently, so you may have to leave the device anywhere from a few minutes to 10 minutes. to see if you can find anything nearby. But it's by far one of the most portable devices I've bought and it's worked really well so far π
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