This Product has been Discontinued. Please consider Relay Shield v3.0 as alternative product.
The Relay Shield utilizes four high quality relays and provides NO/NC interfaces that control the load of high current. Which means it could be a nice solution for controlling devices that couldn’t be directly controlled by Arduino’s Digital I/Os. Standardized shield form factor enables smoothly connection with the Arduino. The shield also has four dynamic indicators show the on/off state of each relay.
Place 2 layers of electrical tape on the top of theArduino's usb connector. This will prevent the relay shield from making contact. Do not operate voltage more than 35V DC.