The RPi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent.RPi Relay Board FeaturesStandard FOR Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boardsHigh quality relays, loads up to 5A 250V AC or 5A 30V DCPhoto coupling isolation, prevent interference from high voltage circuitColor: blue, blackMaterial: PCBOnboard LEDs for indicating relays statusRelay control jumper, allows to control the relays by custom pins other than the default pinsWhat's on the RPi Relay BoardFOR Raspberry Pi GPIO interface:for connecting Raspberry PiRelay screw terminal:for connecting target devicesRelaysPhotocoupler:PC817Relay indicatorLED on: relay NC is opened, NO is closedLED off: relay NC is closed, NO is openedPower indicatorRelay control jumpershort the jumper: control the relays by default I/Os used in the example codeopen the jumper: control the relays by custom I/Os through jumper wiresPackage Contents:1 x RPi Relay Board1 x RPi screws packOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.