Feature: 1. Small size, easy to carry and store, wide measuring voltage range, efficient and convenient. 2. 12‑bit AD microcontroller with high measurement accuracy, and strong anti‑interference. 3. Composed of professional PCB materials, stable performance and long service life. 4. The working voltage is DC12V, the measuring range is DC0-55V, and the relay life is 100,000 times 5. With strict quality control and quality assurance, high safety factor, can be used with peace of mind. Specification: Item Type: DC Voltage Detection ModuleMaterial: PCB Working Voltage: DC12V 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 AO: The positive pole of the measured voltage GND: Negative pole of the voltage being measured 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 Product Function (when The Measured Voltage Is Displayed, Long Press The K2 button for 0.5 seconds to adjust the mode +1): P-1: Charge Monitoring: When the measurement is lower than the voltage VL, the relay is closed, and the voltage is higher than VH the relay is disconnected; P-2: Discharge Monitoring: When the measurement is higher than the voltage VH, the relay is closed, and the voltage is lower than VL the relay is disconnected; P-3: Pull-in Outside The Interval: When the stroke voltage is between VL and VH, the relay is disconnected, and the relay is closed in other cases; P-4: In-zone Pull-in: When the measured voltage is between VL and V2H, the relay pulls in, otherwise the relay is off P-5: Excessive Suction: When the measurement is higher than the voltage VL, the relay is closed, and the voltage is lower than VL the relay is disconnected; P-6: Over Disconnection: When the measurement is higher than the voltage VL, the relay is disconnected, and the voltage is lower than VL and the relay absorbs; Adjustment Parameter Description (the Initial State Of The Module Will Display the measured voltage value): 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 7. After adjusting the ones place, press the 7th "K1", the digital display returns to the initial state and displays the measured voltage value 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. Package List: 1 x DC Voltage Detection Module Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.