1、【NCV Test】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. 2、【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. 3、【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. 4、【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. 5、【Automatic Shutdown】After no induction signal or any operation for about 5 minutes, the test pen will automatically shut down to extend battery life.