Features:  Material: It is made of ABS, and it is perfect at home and electricity industry. It is completely insulated, without exposed metal and conductive parts.   It can be used repeatedly and durable for long time use.  Testing Range: Easily and quickly detects AC voltage with visual and audible voltage indicators, and the testing range is from 12V - 1000V.  LED Flashlight: A LED work light with high brightness and low power consumption helps in illuminating the workspace in dark.  Non-contact Detection: Can be tested without touching the measured object, more safe and easy to use.  Multifunction: The item helps to test AC voltage, circuit breakpoints testing and  test live wire, null line.  Auto-off: It will be off automatically after several minutes without operation or signal to save power.  Portable: The compact size enables you to carry the pen anywhere you want, compact and lightweight design makes it take up little space.  Easy To Use: The tester has three buttons, making it easy to use. One button is used to switch it on or off, one button is used to turn on the   LED flashlight and one "S" button is used to adjust high/low sensitivity.  Wide Application: Non-contact detection in cables, cords, circuit breakers, lighting fixtures, outlets and more. Ideal for testing power cables, circuit breakers,   wall sockets, junction boxes and more.  Voltage Alert: If AC voltage is detected, the buzzer will beep and LED red light will flash. The higher the AC voltage, the higher the frequency of beeps and   flashes. When the normal cable is measured, the battery indicator lights up red and beeps. When the indicator light of the test pen goes out and there is   no sound, this position is the breakpoint position.    Specifications:  Item Type: Test Pencil   Material: ABS   Color: Red, Yellow, Blue  Powered By: 2 x 1.5V AAA Batteries (not included)   Screen: LED Color Light Screen  AC Voltage: 12V -1000V  Frequency: 50Hz/60Hz  Sensitivity: Adjustable(red light is on: high sensitivity; light is not on: low sensitivity)  Zero Wire: The index grid shows the green light "LOW" with no red light flashing and a slow alarm frequency, which is the zero line. Live Wire: The index grid shows the red light "HIGH" and the pen has a red light flashing and the alarm sounds fast, which is the live wire.  Size: Total Length: About 172.8mm/6.8inch, Test Pencil Head Width: About 38mm/1.49inch, Test Pencil Head Thickness: About 27.3mm/1.07inch    Package Includes:   1Pc * Test Pencil   1Pc * User Manual