Gardner Bender GVD-3504 Circuit Alert® Non-Contact Voltage Tester.
Features: - Indicates the presence of AC Voltage for 50-600 volts
- Visual (flashing) and audible (beeping) indicators signal presence of voltage
- Built-in “safe test” feature assures batteries are operating properly
- Compact design fits in shirt pocket
- Operates from 1-AAA battery
- Tests outlets, switches, circuit breakers, wiring and light fixtures