Built-in white LED illumination light provides convenient work in dark areas. Detects AC voltage from 90 to 1000 VAC without metallic contact. Compact size with pocket clip easily fits into pockets or tool pouches. Red LED and audible alarm if voltage is present. Entire outer surface is non-conductive for safety, helps avoid high voltage shock. Powered by two 1.5V AAA batteries (not included). CAT IV 1000V Safety rating. Applications: Electricians, maintenance staff, service and safety personnel, and even homeowners.