Southwire 40126N dual range non-contact AC voltage detector 24-600vac quickly checks for the presence of live voltage on outlets, wiring, circuit breakers, lighting fixtures and switches. This non-contact AC voltage detector features a built-in flashlight for user convenience. The flashing red LED and pulsating beeper indicate the presence of voltage to make this task as safe as possible. DETECTS AC VOLTAGE on two ranges: 24 to 600 V and 100 to 600 V BI-COLOR LED verifies tester is on and range selected LIVE VOLTAGE INDICATOR red LED and beeper BUILT-IN flashlight now 2x brighter CAT lll 600 V safety rating TWO MODES green means high voltage mode, yellow means low voltage mode