Worried that someone may be using wireless hidden cameras, remote listening devices or other wireless surveillance equipment to spy on you? Then put those fears to rest with a Radio Frequency (RF) Signal Detector that seeks out and alerts you to the presence of RF signals that these devices commonly use. If someone is using such equipment in the immediate area, this counter-surveillance device will make sure you know about it. Use it at home, in hotel rooms, clothing store fitting rooms, or anywhere you want to ensure privacy. The sensor detects an enormously wide spectrum of frequencies, ranging from 50MHz all the way up to 3GHz. Plus, its powerful multi-channel scanning ability detects virtually all wireless cameras, listening devices, cell phones and much more. A sensitivity tuner allows you to decrease or increase the sensitivity, depending on your situation. Sensitivity feature can also be used to diminish background signal noise. Both sound and LEDs indicate the strength of the detected signal. If you want to use it in places where you don't want sound to give you away, then switch it into vibrate mode. For truly silent operation, use the included earphone. Requires two 'AAA' batteries (sold separately). A battery low warning LED will illuminate when it's time to replace the batteries.