Features 1、100% Brand new and high quality. 2、Using optocoupler isolation and relay control, AC250V, AC10A DC30V, DC10A. 3、Adopted of high quality electronic components, and accuracy process, ensure for the durability. 4、Strong drive capability with transistor drive. 5、With fixed screw holes for easy installation. Specification Features: 100% Brand new and high quality. Using optocoupler isolation and relay control, AC250V, AC10A DC30V, DC10A. Adopted of high quality electronic components, and accuracy process, ensure for the durability. Strong drive capability with transistor drive. With fixed screw holes for easy installation Low suction and high release. Specification: Conditon: 100% Brand New Small Board PCB Size: Approx. 103mm * 53mm * 1.8cm / 4.1 x 2.1 x 0.7in Package Weight: Approx. 100g/3.5oz Module Interface Left 3 Pin Connector: GND: Module ground Right 4 Pin Connector: GND: Module ground 1N1-1N4: Relay control interface, connected with IO port of MCU Package List: 1 * 4 Channel Relay Module 1 * Relay Schematic Diagram Package List