Feature:1. This product is a relay expansion board specially designed for Raspberry Pi, with 8 relay controls and screw terminal blocks. Bring this product and use your for Raspberry Pi to control power equipment2. Based on for Raspberry Pi 40pin GPIO interface, suitable for Raspberry Pi series motherboards/Jetson3. Using highquality relays, allowing access to loads of 5A 250V AC or 5A 30V DC4. The product come with optocoupler isolation to avoid highvoltage circuit interference5. This relay module using standard guide rail designs, easy to install and use6. Equipped with relay indicator light, easy to check the working status of the relay7. Come with relay selection jumper cap, which is convenient to switch other pins for Raspberry Pi to control8. Reserved control interface, convenient to use with PLC and other controllersSpecification:Item Type: Relay Module for Raspberry PiSupply Voltage: 5VTrigger Signal: 3.3V/5VNumber of Relays: 8 ChannelContact Type: One normally open and one normally closedClosing Current: 6mA (each channel)Through Hole Diameter: Approx. 3mm / 0.1inSize: Approx. 3.5mm / 0.1in3.5mm / 0.1in65mm / 2.6in232mm / 9.1in72mm / 2.8in87mm / 3.4in94mm / 3.7in130mm / 5.1in137mm / 5.4inR: Approx. 1.5mm / 0.1in.Package List:1 x Relay Expansion Board6 x Long Rod Screw2 x Short Rod Screw2 x Nut2 x Connection Column