Apart from a bit long delivery (coming directly from China apparently saw the package) the product works perfectly with Raspberry (test firing of a remote lamp - [...] I do not demand a manual but at least have been a pattern more! For use with Raspberry: do not touch the PIN Group 3 left (2 with jumper) On the PIN Group 4 right GND = connected to the earth of Raspberry VCC = 5V PIN to connect the Raspberry IN1 or IN2 = connect to a PIN Raspberry "controllable"