1、No Contact: This power check pen with NCV inductive AC voltage probe allows the user to simply place the tip near a terminal strip, outlet or power cord. 2、Easy To Operate: You will know that voltage is present when the pen tip glows red and the pen beeps. The live wire detector automatically detects the live or neutral wire. 3、Security Alerts: The voltage detector pen will emit multiple alarms through sound and light. When voltage is detected, the tip will emit a red light and a beep. It will beep at a higher frequency when a higher voltage is detected or closer to the voltage source. At the same time, the screen will be red or green, red indicates detection of high voltage and live wire, green indicates detection of low voltage and neutral wire. 4、Wide Application: This test pen is suitable for detecting AC voltage and neutral wire line judgement, as well as through break point. 5、LED Flashlight: This voltage checker has a bright LED flashlight for working in dim environments and is very convenient.