A non-contact voltage tester serves as a key component in any electrical toolkit, allowing the user to verify the presence of AC voltage prior to working on an electrical installation or during troubleshooting without requiring physical contact with live electrical conductors. The Gardner Bender GVD-3504 Circuit Alert non-contact voltage tester features both audible beeping and visual 360 degree flashing red light indicators to alert the user of the presence of AC voltage from 50 volt to 600 volt. Use to locate breaks in wires and voltage at outlets, circuit breaker panels, light fixtures, switches and motors. Quickly locates the hot terminals in receptacles. Fully insulated probe tip eliminates the risk of contacting live electrical wires. Built in patented safe test feature ensures tester and batteries are working properly. Requires one (1) AAA Battery. Tester is C/ETL/UL Listed, offers a 150 lbs. crush rating, CAT III 600 volt rating.