Notes:1.Built-in sensor, when nearby AC voltage is detected,The green light will flash and an alarm will sound.2.Neutral wire line Set gear to O, when test pen is inserted into hole, the red light is not on, it is Neutral wire line 3.live wire Set gear to O, when test pen is inserted into hole, the red light flashes to be live wire 4.Battery detection Turn to H position, put your finger on Contact pole, place electric pen on positive pole, and place other hand on negative pole. The light is on to indicate that battery is fully , and light is off to indicate that battery is dead. 5.Due to different monitor and light effect, the actual color of item might be slightly different from color showed on pictures. Thank you!6.Please allow slight measuring deviation due to manual measurement. Specifications: Material: Plastics Size: 141x18.6x16mm color:black +yellow Package Contents: 1 x Test Pencil Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.