Features: Three testers in one: Identify circuit breaker to an electrical socket Trace AC cables in walls Sort wires in a bundle Microprocessor controlled Coded transmission allows easy separation of transmitter signal Audible and visual indicators Low battery indicator Cable tracing depth – up to 15″ NEMA 5-15 plug Accessories: Transmitter Receiver Batteries (installed) Specifications: Transmitter voltage range: 100 V to 250 V Power consumption: Approximately 1 W Frequency range: 50/60 Hz Transmission frequency: Approximately 8 kHz Transmitter frequency: Approximately 10 Hz Receiver tracing depth for fuse identification: Approximately 0 to 10 cm (4 in) depending on local conditions Tracing depth for cable location: Approximately 0 to 40 cm (15 in) depending on local conditions With one tool, the Amprobe ECB50A Breaker Tracer, you can perform three types of tests: identify the circuit breaker to an electrical socket, trace AC cables in walls up to 15″, or sort wires in a bundle.