Module description:1. Maximum load on normally open pin: AC 250V/10A, DC 30V/10A.2. Trigger current 5mA;3. Module can be set high level or low level trigger by jumper wire;4. Power indicator light (green), relay status indicator light (red);5. Module size: 50mm*41mm*18.5mm.Module interface specifications:1. DC+ : DC power supply positive pole2. DC- : DC power supply negative pole3. IN1 : channel 1 signal triggering pin4. IN2 : channel 2 signal triggering pinRelay output:1. Normally closed pin (NC1) : channel 1 relay normally closed pin2. Common pin (COM1) : channel 1 relay common pin3. Normally opened pin (NO1) : channel 1 relay normally opened pin4. Normally closed pin (NC2) : channel 2 relay normally closed pin5. Common pin (COM2) : channel 2 relay common pin6. Normally opened pin (NO2) : channel 2 relay normally opened pinHigh or low level trigger option:1. S1:It is option switch for channel 1 relay;2. S2:It is option switch for channel 2 relay;3. It is low level triger if COM pin connect to LOW pin; It is high level triger if COM connect to High.