What's in the box:

Charging Discharge Voltage Monitor Test Relay Switch Control Board Module DC 12V (Standard)

Function:
When board connected the power supply, IN signal terminal connected the measured voltage, then display the measured voltage value;
Short press K1 can enter setting threshold voltage, 6 times for a cycle(former 3 times are for lower limit and the other 3 times are for upper limit);
When the measured voltage is lower than the lower limit or higher than upper limit value, the relay works and the buzzer alarms.
In the range of setting value, the relay stop working and the buzzer will not alarm.

Specifications:
Output Capacity: Can Control the Load within DC 30V or AC 220V 10A
Power Supply Voltage: DC 12V
Test Voltage Range: DC 0-30V
Static Current: 20mA
Working Current: 50mA
Working Temperature: -40-85C
PCB Size: 64 * 40 * 18mm / 2.52 * 1.57 * 0.7in (L * W * H)
PCB Weight: 27g / 0.96oz

Package List:
1 * Switch Control Module