The task of locating AC circuits is now made quick and easy. No more guessing or trial and error, with our Circuit Breaker Finder, locating the correct circuit breaker to an AC outlet or lighting fixture is now easier than ever. You have to have power to the outlet or light or live wires that you want to find the circuit to. The power drives the device to send the signal to the receiver you use at the breaker/service panel. Good luck. Get it today!