DC Voltage Detection Module Digital Display High Accuracy Relay Electronic Component DC12V Material: PCB Measuring Range: DC0-55V Relay Life: 100,000 times Measurement Accuracy: 12-bit AD chip Interface Description: Input Terminal: VCC: Positive power supply GND: Negative power supply Output: NC: NC terminal COM: COM terminal NO: NO terminal Key Description: K1: Short press to adjust, long press for 2 seconds to turn on/off display K2: Short press to adjust the time selected position plus 1 long press for 0.5 seconds, display mode +1 1. Press the first "K1" digital tube hundred digits to flash, adjust the lower limit hundreds digit, press "K2" 0-9 to change and adjust 2. After adjusting the hundred digit, press the second "K1" digital tube ten digits to flash, the lower limit tens digit is adjusted, press "K2" 0-9 to change and adjust 3. After adjusting the tens digit, press the third "K1" digital tube to blink, and adjust the lower limit ones digit, press "K2" 0-9 to change and adjust 4. After adjusting the units digit, press the 4th "K1" digital tube to blink the hundred digit, and adjust the upper limit hundreds digit, press "K2" 0-9 to change and adjust 5. After adjusting the hundred digit, press the 5h "K1" digital tube tens digit to flash, adjust the upper limit tens digit, press "K2" 0-9 to change and adjust 6. After adjusting the tens digit, press the 6th "K1" digital tube to blink, and adjust the upper limit ones digit, press "K2" 0-9 to change and adjust During the above adjustment process, if no key is pressed for adjustment within 2 seconds, it will automatically jumping back to the initial interface, and the setting data will be saved