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. Frequency 50 - 500 Hz Application Non-Contact Detection and Testing of AC Voltage; Not Recommended for Tamper-Resistant OutletsBatteries 2 x AAA Overall Height 0.72" (1.8 cm) Pollution Degree 2 Drop Protection 6.6' (2 m) Special Features Green LED Indicates Power On; Red LED Indicates Voltage Detected with Audible Beeps Ingress Protection €” Overall Width 1" (2.5 cm) Standard CAT IV 1000V Weight 0.8 oz (23 g) Overall Length 5.5" (14 cm) Material Polymer Body and Electronic Components Type Voltage Tester Pen Battery Life €” Included Instructions and 2 x AAA 1.5 Volt Batteries Voltage 50 - 1000V AC Style_Name NCVT Pen Battery Type Alkaline