Professional circuit breaker finder with stable performance and accurate test. Suitable for house, office, factory power network reconstruction, etc. Features: Find circuit breaker or circuit fuse quickly and accurately. Sensitivity can be adjusted through the ON/OFF switch. The operator can determine the status of circuit connection according to the 3 LEDs. NCV indicator light is only for UT25B. Support GFCI test on socket. The receiver is powered by a 9V battery(not included). The transmitter works on 110-125V. Specifications: Receiver: Type: UT25A / UT25B(optional) Operating Voltage: 90-120V Operating Frequency: 50-60Hz NCV Working Voltage: 80V (only for UT25B) Receiving Distance: 30M Power Supply: 1 * 9V Type 1604/6F22 Battery(not included) Operating Temperature: 5C-40C Transmitter: Working Voltage: 110-125V Operating Frequency: 50-60Hz Fuse: 1A, 250V, Dia.:4*11mm Receiver Size: 19 * 5 * 3cm / 7.48 * 1.97 * 1.18in Receiver Weight: 91g / 3.22oz Transmitter Size: 10.5 * 5 * 2.5cm / 4.13 * 1.97 * 0.98in Transmitter Weight: 79g / 2.81oz Package List: 27.5 * 16 * 4cm / 10.83 * 6.3 * 1.57in Package Weight: 261g / 9.25oz Package List: 1 * Circuit Breaker Finder(Receiver) 1 * Socket Tester(Transmitter) 1 * User Manual