General Tools VS4000 Voltage Detector Audible/Visual NCV Tester with Adjustable Sensitivity; safely detect hot wires Beeper sounds and red LED flashes rapidly when voltage is detected; features bright white work light 2.5 inch max detection distance; 5 to 1000VAC detection range; low voltage range suitable for testing Relays ETL certified CAT IV 1000V; identifies Hot, Neutral Conductors Includes 2 AAA batteries, instructions and 1 Year Warranty