The Relay Shield for Arduino v1.1 is Arduino compatible. Relay Shield for Arduino is a smart module with 4 mechanical relays providing an easy way to control high voltage. The max switching power is 35VDC 70W for each channel. It can be directly controlled by Arduino through digital IOs with external 9V DC supply. Compared to the Relay shield 1.0, the v1.1 version use 4 selector instead of those push buttons used on version1.0. This makes it more convenient to control the relays manually.

Note: Please note that the pins on relay shield should not touch the USB connector of Arduino UNO when they are connected.