The output voltage is DC 110~2600V, you can turn the voltage adjustment knob clockwise to increase the voltage and counterclockwise to decrease the voltage. The output current is 0.25~3.4mAh, you can turn the voltage adjustment knob clockwise to increase the current and counterclockwise to decrease the current. When testing MOS tubes, transistors, and Zener diodes, it is recommended to adjust the current to the minimum scale of 0.25mA. When testing LED backlights, it is recommended to adjust the current to the maximum scale of 3.4mAh. Built-in 660mAh lithium battery to supply power, and you can charge it via the Type-C interface in time. Wide Applications: This tool can be widely used to test MOS, triode, IGBT, diode, Zener diodes, diode bridge maximum voltage capacity, capacitor and varistor voltage verification, LED backlight and light board testing, etc. Specifications: Output Voltage: DC 110~2600V Output Current: 0.25~3.4mAh Battery: 1 x Lithium Battery, 660mAh (included) Charging Port: TYPE-C Text Color: B-Red Material: ABS Color: White 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 to differ slightly from the real one. The measurement allowed error is +/- 1-3 cm.