1. NONCONTACT: With NCV inductive probe for AC voltage; Just place the tip near a terminal strip, outlet, or supply cord. When the tip glows red and the pen beeps, you know there's voltage present. The live wire detector can automatically detect the live or neutral wire. for breakpoint Test. Handy circuit tester for electricians, homeowners. 2. DUAL RANGE: Detects standard and low voltage (12 1000V AC / 48 1000V AC) for more sensitive and flexible measurements. Press the S button to adjust sensitivity and adapt low range for doorbells, thermostats, irrigation wiring etc.; The NCV sensor automatically recognizes the voltage and displays it on the bar graph. 3. It sends out multiple alarms through sound and light. When the voltage is detected, the tip sends out red light and beeps. When the higher the sensed voltage is, or the closer it is to the voltage source, it beeps at a higher frequency. At the same time, the screen will be red or green, red means voltage and live wire are detected, green means low voltage and null wire are detected.