This Dual-Range Non-Contact Voltage Tester automatically detects low voltage and standard voltage. A bright green LED will tell you the tester is working and also functions as a worklight. The light flashes red and two distinct warning tones sound when either low or standard voltage is detected.PRODUCT FEATURES:- Automatically detects and indicates low voltage (12-48V AC) and standard voltage (48-1000V AC) allowing broad application - Non-contact detection of standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, outlets and wires - Non-contact detection of low voltage in security, entertainment, communications, environmental control, and irrigation systems - High intensity, bright green LED indicates the tester is operational and aids in illuminating the workspace - Dual Range testing, select 12-1000V AC or 48-1000V AC - Auto power-off feature conserves and extends battery life - CAT IV 1000 Volt rating provides expanded operation and protection - Lightweight, durable polycarbonate plastic resin construction; convenient pocket clip - 9.8 ft / 3 m drop protection - Safety Rating: CAT IV 1000V - Conforms to CE requirements