Features 6 Detecting Functions: This electric tester pen has 6 detecting functions, such as automatic detection, wire passing through detection, disconnection and breakpoint detection, DC detection, AC detection and high voltage detection. Illuminated Night Vision Lamp: This electric tester pen comes with an illuminated night vision lamp, which does not affect the work in the dark environment, simple and convenient. Compact Design: This electric tester pen is designed in a compact size and light weight, making it easy to carry in your pocket, very convenient. Excellent ABS Shell: This electric tester pen is made of excellent ABS material for the shell, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. Wide Application: This electric tester pen has a very wide range of applications, and is suitable for the direct detection of 12 to 220V AC and DC and indirect detection of AC neutral wire, phase line and breakpoints, but also for detecting the on and of Specification: Item Type: Digital Display Lighted Tester Pen Material: 45 Steel, ABS Battery: 1.5V LR44 150mAh x 2 ( Shipped With Built In Battery ) Test Voltage Range: 12V-220V (AC, DC) Package List:1 x Electric Test Pen  Package List 1 x Electric Test Pen