The Milwaukee voltage detector with LED is used for residential, commercial and industrial applications. The 2202-20 can detect between 50 and 1000V AC and has an industry leading safety rating of CAT IV 1000V. 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. Extra bright LED work light makes working in dark areas easier than ever Green Power On indicator light tells you the voltage detector is working properly before use Pocket clip allows for easy storage and retrieval from pocket Powered by two easy to replace AAA batteries CAT IV 1000 V safety rating is safe for all applications including industrial applications