Features: Automatically and quickly finds correct breaker or fuse. Quickly and easy identifies conditions of circuit socket. MS5902 disconnect switch detector PREFIX = O. Security Level IEC1010-1CATII 600V. Operating voltage AC230V. Breaker convenient search function to quickly find and target branch circuit breakers loop(With MS5902T use). Descriptions: Automatically adjust the sensitivity. Visual and audible indication. Test function tripod socket socket connection status LED. display correct open ground. Ground and FireWire reverse. Zeroline and FireWire reverse. Specifications: Power Supply: 1 * 9V battery/6F22(not included) Color: Green & black Plug type: EU plug Voltage: 230V Package Includes: 1 * Circuit Breaker LED Tester Finder Receiver 1 * Circuit Breaker LED Tester Finder Transmitter