Klein Tools ET450 Advanced Circuit Breaker Finder and Wire Tracer Kit for Energized and Non-Energized Breakers, Fuses, and WiresRELIABLE CIRCUIT TRACING of energized or non-energized breakers, fuses, and wiresDETECT TRANSMITTED SIGNAL through drywall, cement block, and underground with easy to adjust sensitivity levelsTRACE WIRE, CONDUIT OR PVC PIPES or trace a single wire in a bundle for versatilityAUDIBLE AND VISUAL INDICATORS on receiver denotes signal strengthNCV FUNCTION AND FLASHLIGHT on receiver for additional functionality