The NCV3 Non-Contact Voltage Detector senses low voltage (24 to 48V AC) and high voltage (48 to 1000V AC). The bright green LED indicates the tester is operational, while red LED visual and audio alerts indicate live voltage. Includes a clear LED worklight and a magnetic mount. The NCV3 is ETL listed, rated CATIV 1000V and is backed by a 1-Year limited warranty.