• When it detects AC voltage, the detection indicator LED will flash red and the built-in buzzer will sound in short beeps• Durable ABS plastic resin casing and compact design• With pocket clip for convenient storage and access• Safe, efficient, quick and accurate testing• Variable sensitivity• Equipped with LED torch for operation in low-light conditions• Suitable for detecting whether a cable, wire or socket contains AC voltage, or use it to locate breakpoint on a live line• After adjusting the unit’s detection sensitivity to a suitable level, you can use this unit to discriminate between Live terminal and Neutral terminal on an energized AC110V power socket