Consists of a transmitter and a receiverTransmitter generates a signal by a plug style tool that also verifies the correct wiring of outlets with coloured LED's and includes GFCI test functionalityWith the transmitter plugged in and the receiver at the circuit breaker panel, the receiver will detect the signature emitted from the transmitter and confirm the line between receptacle and circuitAs the receiver scans over the breaker panel, an audible alarm ("tick" sound) and bright LED (flashing red) visual indication will alert the user as it approaches the breaker associated with the circuit under testAdjustable sensitivity to help quickly identify circuit breakerIncludes: R5500 Receiver, R5500 Transmitter, 9V battery