The Relay Shield is Compatible with Arduino 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 an external 6.5~12V DC supply. With the onboard 4 control keys,you can also control the high voltage without programming.(Manually).

Note : Make sure that the pins on the Shield do not touch the USB Connector on the Arduino