Features: Digital display DC voltage detection, control the relay output. Adjustable voltage limit: 0-99.9V. When the measured voltage is lower than the lower limit or higher than upper limit value, the relay works. Can be used for voltage detection switch, battery over/under voltage protector or discharge meter. Notice: The relay control panel features single mode voltage detection function. Max. trigger current is 10A(AC 277V, DC 30V), please don't connect it with load over DC 30V. This relay module is not suitable for battery discharge. Polarity for voltage detection can't be connected reversely, user should connect the wire after power off. Specifications: Relay Voltage: DC 12V Working Power: DC 10-16V Voltage Detection : DC 0-99.9V Error: +/-0.1V Timing : 0-999 minutes cycle A set of transformations(normally open/normally closes) Contract Load: 10A/277V AC, 10A/30V DC Contract Resistance: 100m1A-6V DC Mechanical Durability: >10 million times Electrical Durability: >100,000 times (10A-250V AC) Standby Current: 16mA 12V, Digital Display Closed Smallest 6mA/12V, Relay Timely 45mA/12V Working Temperature: -40-85C Dimension: 50 * 40 * 20mm Weight: 27g / 0.95oz Package List: 1 * Relay Switch Control Module