... and sound when detect wire non-contact voltage detection LED LIGHT Voltage Sensitivity: 90-1000VAC Bandwidth: 50/60Hz ... and flashing LED indicate the presence of voltage Use to detect voltage in outlets,lighting fixtures,circuit breakers,wires ... find a break in a wire.Safe,non-contact voltage detectionLED LIGHTPower: (Size AAA)1.5V x 2 ... Gross Weight: 13kg Pen design Non-contact Voltage Detector VD02