The Extech CB10 is an AC Circuit Breaker Finder/Receptacle Tester that locates circuit breakers and tests receptacle wiring. The CB10 allows the user to quickly locate 110 V to 125 V AC circuit breakers and fuses with audible and visual circuit breaker indication. The product also features a variable sensitivity adjustment to pinpoint correct circuit breaker. This product is complete with a year warranty, the receiver and GFCI transmitter and a 9 V battery for the receiver.