Features:  Material: It is made of plastic, 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.  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.  Adjustable Sensitivity: Dual range 12V-1000V/48V-1000V-choose different ranges according to your needs; Different voltage tests and dual-range  tests-Different frequency alarms are used to distinguish live and neutral lines; the default measurement range of AC voltage is 48-1000V,   and the sensitivity can also be adjusted to measure 12-1000V. It can meet the needs of selecting the most suitable sensitivity before testing   on different occasions and different objects.    Specifications:  Item Type: Voltage Tester Pen  Material: Plastic  Color: Red+Black  Powered By: 2 x 1.5V AAA Battery(not included)  Working Voltage Range: 12V -1000V  Frequency: 50Hz/60Hz  Test Voltage Range:   high sensitivity: 12-1000V   medium sensitivity: 48-1000V   low sensitivity: distinguish the zero line from the fire line  CAT III 1000V   Working Temperature: 0-40°C  Storage Temperature: -10~50°C   Humidity: <=85%  Size: About 60 x 28.5 x 26.7mm/2.36 x 1.12 x 1.05inch(Length x Width x Thickness)    Package Includes:   1Pc * Voltage Tester Pen  1Pc * User Manual