Raspberry Pi Expansion Board, Power RelayOverviewThe 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 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 circuitOnboard LEDs for indicating relays statusRelay control jumper, allows to control the relays by custom pins other than the default pinsComes with development resources, including examples in wiringPi, WebioPi, shell, python, and bcm2835What's on the RPi Relay BoardRaspberry 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 jumper short 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 wiresPhotos RPi Relay Board RPi Relay Board back view RPi Relay Board connecting with Raspberry Pi Control the lamp by mobile phoneNote : the Pi in the photos is NOT included.DimensionsDevelopment ResourcesWiki : www.waveshare.com/wiki/RPi_Relay_BoardLieferumfangRPi Relay Board x 1RPi screws pack (2pcs) x 112