The Crescent CVS600V Voltage Detector features voltage detection range 12-600V AC, 50-60Hz which allows tracing of wires behind walls, at switches or receptacles and includes a handy pen size tool that clips securely inside your shirt pocket. Features Voltage detection range 12-600V AC, 50-60H. Sensing Tip, 360º Visual Indicator and Sensitivity Adjustment. 2 x 1.5V button style batteries included. Adjustable sensitivity. Specs Material: Plastic Colour: Blue Dimensions: 30x150x25mm Warranty 1 year limited warranty.