The Relay Shield offers four high-quality relays that control high-current loads on Arduino/Seeeduino boards. It also offers an NO (NO) / NC (NC) interface. An ideal solution for controlling devices that cannot be controlled directly by Arduinos Digital I/OS. The standardized shielding factor enables a smooth connection with Arduino and compatible devices. The shield also has four LED indicators that indicate the on/off state of each relay.Relays are useful for switching AC devices such as fans, lights, motors or high current DC drives such as solenoid valves, etc. on and offThis text is machine translated.