【Monopolar Non-Contact Voltage Detector】: Simply place the tip near the junction box, outlet or power cord. You will know that voltage is present when the tip lights up red and the pen beeps.【Triple Alarm】: When there is voltage, the voltage tester will send out a sound and light alarm, and the bar graph will change.【12~1000V AC】: Standard mode (measuring range 48~1000V AC) and sensitivity mode (measuring range 12~1000V AC). Both can be changed freely through the S button. [Application example]: Detect whether there is voltage in the environment and whether the power line is live; distinguish neutral line and line conductor by alarm intensity, etc. Other highlights: built-in LED flashlight/low battery indicator/auto power off/portable pen clip.