Brand OPENJUMPER Model OJ-XM1139 Quantity 1 Color Red + blue Material PCB Features 4-CH digital relay module provide 4-CH input and output Can connect Max. 30V 10A or AC 250V 10A devices to control electric lamp and electrical machine etc; When using the Arduino do interactive projects many large current or high voltage equipments cannot use Arduino digital IO port to control directly (such as solenoid valves lights motors etc.) you can consider to use relay scheme to solve. Specification Power supply voltage: 5V; Drive voltage: 5V TTL; Contact: Each channel with normally open contact and normally-closed contact; DC 30V 10A or AC 250V 10A; Pin definition: S1: relay 1 signal input S2: relay 2 signal input; S3 relay 3 signal input; S4: Relay 4 signla input; +: VCC; -: GND Application Great for DIY project English Manual/Spec Yes Packing List 1 x Module