Product description Material: Electronic material Size: 50.5mm(length)*38.5mm(width)*18.5(height) Power supply voltage: 5VDC Current: more than 100mA Load: 250V 10A AC or 30V 10A DC There are 4 fixing screw holes around the board, the hole diameter is 3.1mm, which is convenient for installation and fixing The relay chooses Songle relay, single pole double throw. One common terminal, one normally open terminal, one normally closed terminal Optocoupler isolation, good anti-interference Low level pulls in and high level releases. The status indicator light is on when it is closed, and it is off when it is released VCC is the system power supply, and JD_VCC is the relay power supply. Just plug in the jumper cap Wiring instructions: VCC: system power positive GND: system power negative IN1--IN2: Relay control port Quantity: 1pcs Package content: 1*5V8 relay 1.5V 8-Channel Relay interface boardeach one needs 100mA Driver Current; Equiped with high-current relay, AC250V 10A ; DC30V 10A 2.Each relay has normally open and normally closed contactCan be selected by jumper relay and TTL or ground. 3.With power indicator8-way road has a status indicator. With a relay coil to absorb the diode protection. 4.Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) 5.The 8 channels are optically isolatedsafe, reliable, anti-interference. Widely used for all MCU control, industrial sector, PLC control, smart home controlFor a complete data sheet for this relay board