I would hope that most of us don’t need this, but I would be remiss not to include this on a spy gadget list. This product uses a passive, wireless and infrared scanning technique. It can accurately detect eaves dropping, location trackers, wireless pinhole cameras, wired cameras, electrical radiation sources and so on. The GPS Tracker detector can detect magnetic suction positioner and bug, standby magnetic locators and GPS trackers with a magnetic field sensor. It can also detect intense radio signals radiation around environments. The sensitivity can be changed by altering the potentiometer . You can increase sensitivity, widen detection range, reduce sensitivity, shorten detection range, and identify radio wave sources faster. The detection modes are: 1: Infrared detection 2: Vibration (mute) detection 3: Buzzer detection. It comes with a rechargeable lithium-ion battery, one hour fast charging and each full charge can be used for 25 hours or 25 days on standby mode.