The output voltage is direct current 110~2600V, you can turn the voltage adjust button clockwise to make the voltage bigger and counterclockwise to make the voltage smaller. The output current is 0.25~3.4mAh, you can turn the voltage adjust button clockwise to make the current bigger, and counterclockwise to make the current smaller. When testing MOS tubes, transistors, and Zener diodes, it is recommended to adjust the current to the minimum scale of 0.25mA. When testing the LED back light board, it is recommended to adjust the current to the maximum scale of 3.4mAh. Built-in 660mAh capacity lithium battery to supplys power, and you can recharge it through the Type-C interface in time. Wide Applications: This tool can be widely used for testing MOS, triode, IGBT, diode, zener diodes, diode bridges max. voltage capacity, capacitor and varistors' voltage verification, LED backlight and light board testing, etc. Specifications: Output voltage: direct current 110~2600V Output current: 0.25~3.4mAh Battery: 1 x lithium battery, 660mAh (included) Recharge port: TYPE-C Font color: B-Red Material: ABS color: white Package Contents: 1 x Transistor Withstand Voltage Tester with Test Pen