Specification:Model: GK7Working environment: 0~40Relative humidity: less than 85%Voltage detection range: 70V ~ 1000V ACFrequency range: 50Hz ~ 60HzSafety category: CAT 3-level 1000VPower supply: 2* AAA battery (NOT included)Size: 152 * 27 * 23.5mm / 6 * 1.1 * 0.9in Overview:This unit is a portable AC voltage detector, which can be used to check if a cable or socket is live. You can use it to detect AC voltage in outlets, lighting fixtures, circuit breakers, wires, and cables or to find a break in a wire. When it detects ac voltage, the LED will light and the buzzer will sound. It features non-contact voltage detection. The detection range is: 70-1000V AC, at 50/60Hz.Features: Accurately detects AC voltage ranging from 70 to 1000V, distinguishing the voltage with LED light and buzzer sound. Durable ABS plastic resin ensures a compact build and its pocket clip allows easy carry. High efficient, quick and accurate. You don't have to call a professional electrician nor make contact with the wire just to know whether electricity runs through it. This device would determine whether there is some form of electricity running through the wire without you actually needing to touch it. Ensuring your overall safety. Non-contact feature ensures a safer application.