RPi Relay Boards Enable Pi to Control High-Voltage and High-Current Devices and Make Common Domestic Appliances Smarter Supports for Raspberry Pi A + / B + / 2B / 3B High quality relay, loads up to 250VAC / 5A, 30VDC / 5A Onboard LEDs for indicating relay status Photo link isolation, prevent interference from high voltage circuit Relay control jumper, ensures to the relays by custom pins other than the standard pins Comes with development means, including examples in wiringPi, WebioPi, shell, python, and bcm2835 Specification:Condiiton: Brand NewFor Raspberry Pi GPIO interface: For connecting Raspberry PiRelay screw terminal: For connecting target devicesRelay indicator:LED on: relay NC is open, NO is closedLED off: relay NC is closed, NO is openPower indicatorRelay control jumper:short the jumper: control the relay by standard I / Os used in the example codeopen the jumper: control the relay by custom I / Os via jumper wiresTerminal Description:The expansion board has four terminals, each terminal has three pins for connecting external circuitsColour: blueMaterial: pcbPackage Contents:1 * Expansion Module for Raspberry PiOnly the above package content, other products are not included Note: Light 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