1、Digital display DC voltage detection, control the relay output. 2、DC 6~80V relay interface board with 2 buttons for easy operation. 3、With clear LED display, convenient to check the value. 4、Adjustable Voltage Detection Range: DC 0~99.9V. 5、When the measured voltage is lower than the lower limit or higher than upper limit value, the relay works. 6、Can be used for voltage detection switch, battery over/under voltage protector or discharge meter. 7、Comes with a cover for conservation. 8、With clear LED display, convenient to check the value. Adjustable Voltage Detection Range: DC 0~99.9V. 9、Comes with a cover for conservation. DC 6~80V relay interface board with 2 buttons for easy operation. Features: Digital display DC voltage detection, control the relay output. DC 6~80V relay interface board with 2 buttons for easy operation. With clear LED display, convenient to check the value. Adjustable Voltage Detection Range: DC 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. Comes with a cover for conservation. Specifications: Material: PCB + ABS Working Voltage: DC 6~80V Voltage Detection Range: DC 0~99.9V Error: +/-0.1V Working Current: 8mA/24V(relay open, LED displays OFF about 4mA/24V); 58mA/24V(relay closed) A set of transformations(normally open/normally close, NO/NC) Contact Load: NO: 30A/250V AC or 30A/30V DC; NC :20A/250V AC or 20A/30V DC Attention: Because high voltage DC electric arc damages relay contact, so the electric load above DC60V load current is less than 10A. Contact Resistance: ≤100mΩ(1A 6VDC) Mechanical Durability: 10 millions Electricity durability: >100,000 (20A~250VAC) Operating Temperature: -40~85°C Item Size: 9.4 * 5.2 * 3cm / 3.7 * 2.05 * 1.18in Package Size: 9.5 * 6 * 3cm / 3.74 * 2.36 * 1.18in Package Weight: 85g / 3oz Package List: 1 * Relay Switch Controller 1 * Relay Switch Controller