The Milwaukee 2202-20 Voltage Detector with LED is used for residential, commercial and industrial applications. The 2202-20 can detect between 50 and 1000-Volt AC and has an industry leading safety rating of CAT IV 1000-Volt. With a built in bright LED work light; the 2202-20 is two tools in one. The durable tip allows for easy checking of power outlets. The 2202-20 is also designed with a green "Power On" indicator light so you know the voltage detector is working properly before use. Includes 2 AAA batteries.