Features - Automatic detection, host use, the host will automatically vibrate on you when there are eavesdroppers in the environment, pinhole camera, casino, etc. Indicator light - With indicator light to show signal strength, find signal quickly sourceSensitivity - Adjust potentiometer to adjust sensitivity. (Increase the sensitivity to increase the detection range or decrease the sensitivity range: - Detect if your car or office has a wireless spy or wireless bug. - Detect if your phone is spied on or abnormal (sends a signal when there is no reason to go to sleep). - Detect if your car is equipped with GPS tracking, GPS location tracking. - Detect the field strength of wireless network signals, cell phone base station signals and wireless monitoring systems