Circuit Breaker Finder Receiver Transmitter 110V Transmitter Input Voltage is available in 110V -120V at 50~60Hz The reciever will then beep and its green LED will flash when the signal is detected Receiver Battery is 9V with size of 186 x 90 x 38mm and weigh approx.150g Accuracy is specified for a period of one year after calibration at 18C to 28C, with relative humidity &lt;75% Work for either circuit breakers or fuses