The Raspberry Pi relay board comes with standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards The Raspberry Pi relay module is high quality relays, loads up to 5A 250V AC or 5A 30V DC This 3 channel raspberry pi expansion board with relay control jumper, allows to control the relays by custom pins other than the default pins The 3 channel relay board has photo coupling isolation, prevent interference from high voltage circuit Feel free to contact us if you have any problem with using this product, we will always be ready to help solve the problems.