1、Non-contact Detection: when the electric test pen detected the AC voltage, the screen will display red and full signal, and beep sounds up to alarm you. 2、Sensitivity Adjustment: you can adjust the high or low sensitivity by the "S" button. The green backlight is low sensitivity, while the yellow is high. 3、Fire/Zero Wire Detection: insert the pen tip into the socket to detect zero/live wire, red backlight flashes, the LCD signal is full and beep sounds up when detecting live wire. 4、Breakpoint Detection: moving pen along with the wire, sound and light alarm will stop once there is breakpoint. 5、Partition Wall Measurement: safely contact the electricity to check the on-site installation line troubleshooting, maintenance and safety factor improvement. 6、Reliable Quality: High quality ABS material compact designed is easy to carry, inbuilt with smart motherboard that ensures the stable performance. 7、LCD Digital Test Pen: high-definition LCD screen with backlight, you can check the data clearly. 8、Flashlight Lighting: auxiliary illuminating the working area during night or in the darkness.