Klein Tools Non-Contact Voltage Tester detects standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, non tamper-resistant outlets and wires. A bright green LED indicates the tester is powered on. It changes to red and an audible tone sounds when voltage is detected. Voltage Tester provides non-contact detection of voltage in cables, cords, circuit breakers, lighting fixtures, switches, non tamper-resistant outlets and wires. Volt Pen with high intensity, bright green LED indicates the tester is powered on. When voltage is detected, a high intensity, bright red LED illuminates and an audible tone will sound. 50 to 1000 VAC power operating range allows broad application. Auto power-off feature conserves and extends battery life. CAT IV 1000V safety rating. Lightweight compact design with a convenient clip to fit securely in your pocket. Product not recommended for testing tamper-resistant outlets; use Cat. Nos. NCVT-2P or NCVT-3P in low voltage mode. Includes instructions and 2 x AAA 1.5 volt batteries. 6.6-Foot (2 m) drop protection.