Features: 1Quickly and easily identify correct circuit breaker or fuse protecting a specific electrical circuit 2Sensitivity can be adjusted through the ON/OFF switch 3The operator can determine the status of circuit connection according to the 3 LEDs 4Features visual flashing light and an audible beeping to alert you when the correct breaker is identified 5Professional tool for house office factory power network reconstruction etc Specification: Description:By using a transmitter and receiver this circuit breaker finder quickly and easily identifies individual branch circuits at the panel box without interrupting power. It is the best way to accurately locate circuit breakers. They are compact in size and extremely easy to use.Features: Quickly and easily identify correct circuit breaker or fuse protecting a specific electrical circuit. Sensitivity can be adjusted through the ON/OFF switch. The operator can determine the status of circuit connection according to the 3 LEDs. Features visual flashing light and an audible beeping to alert you when the correct breaker is identified. Professional tool for house office factory power network reconstruction etc. Specification: Receiver Type UT25A / B Operating Frequency 50-60Hz Power Supply 1 x 9V Battery(Not Included) Operating Temperature 5-40 Storage Temperature -20-60 Transmitter Operating Frequency 50-60Hz Fuse Receiver Size(appr.) 19 x 5 x 3cm / 7.5 x 2.0 x 1.2 Package Weight(appr.) 262g Package Included:1 x Circuit Breaker Finder (Receiver)1 x Socket Tester (Transmitter)1 x User Manual