If you want to detect whether your mobile phone has been tapped or the camera has been maliciously turned on, you can turn off the data Internet switch and wifi switch of the mobile phone, turn off the screen, and then put the detector next to the mobile phone. If the mobile phone itself transmits a signal for no reason, it means that it has been monitored or has been secretly photographed. This radio detector can detect whether a car has been installed with a GPS locator, whether there are wireless eavesdropping or wireless sneak camera devices in the hotel, or detect whether your mobile phone has been tapped. As long as the radio wave signal is within 1MHz-10GHz, it be detected. According to the signal strength and distance of the device under test, the sound alarm threshold can be set (rotate the knob in the upper right corner to adjust). When the received signal reaches the threshold, the detector sound an alarm prompt! The closer the distance to the device under test, the larger the displayed value is, the stronger the signal is., Weight: 0.36817197754 Pounds, Manufacturer: Prterver