1. 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. 2.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. 3. Portable Size: The small size of this tool is very convenient for everyday use, you can carry it in your tool bag without taking up too much storage space. 4. Built-in 660mAh large capacity lithium battery to supplys power, and you can recharge it through the Type-C interface in time. 5. 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. Colour:white+blue Material:plastic Package Contents: 1 x Transistor Withstand Voltage Tester with Test Pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.