1. display with voltmeter, voltmeter error of 0.1V, range 0-40V. (Note: To ensure the accuracy of the voltmeter, please ensure that the input voltage is above 3V). 2. Touch the key to switch measuring input or output voltage, and has a light show which is being measured voltages. 3. Power off memory, display it to the last circuit voltage values measured after power. 4. Press touch button for 3 seconds to turn off the LED display, touch the button again to turn on the LED display. 5. The band terminals, no iron can also be easy to use, and retention wire connection point. 6. The maximum output current of up to 2.5A. 7. The current switching lights are red.