?NCV?Non contact voltage tester provides the easiest and safest way of checking for electrical current in a wire, outlet, switch or lamp that has mysteriously stopped working. ?High Low Sensitivity?Switch sensitivity mode between High and Low based on your needs at work. High for Testing 12V-1000V, Low for Testing 48V-1000V ?Visible Audible Alarm?The tip glows in red and beeper sounds at high frequency when high voltage is detected while yellow light and low frequency beep indicate low voltage. ?Flashlight Red Pointing Light?Built-in flashlight brings you convenience when working in dark or encounter power blackout. Red pointing light can be used to point at something at job sites. ?Customer Service? 3 years warranty and lifetime technical support are available on our non-contact voltage sniffer. We encourage you to contact us if there are any questions