The Triplett 9602 Sniff-It 2 is a high performance non-contact AC Voltage detector with adjustable sensitivity. It provides a wide measurement range of 5 to 600 Volts AC . The high sensitivity allows it to detect low voltage AC wiring commonly found in doorbell circuits, thermostats, control circuits, and video surviellance camera power. The ABS plastic housing provides impact and drop resistance in a sleek ergonomic design. Includes pocket clip and A23 battery. 5 year warranty.