The PowerFinder™ Circuit Tracer is designed to be used by experienced, trained electrical workers to identify and/or trace circuits. This requires that the transmitter be integrated into the circuit being traced or identified and that the circuit is powered by 9 to 300 volts AC or DC (680 VAC or 1000 VDC when using the 38583 High Voltage Adapter). The transmitter is designed to plug into a standard 120 V outlet.