The weak current of the Raspberry Pi IO output can control the on and off of strong current through this product, and is often used in smart homes and other strong electricity field. Combined with the network function of the Raspberry Pi, remote control of home appliances can be realized.Features:1. Applicable for Raspberry Pi A+/B+/2B/3B.2. Adopt high-quality relays, durable to use.3. The relay allows access to up to 5A 250V AC or 5A 30V DC.4. With optocoupler isolation to avoid high voltage circuit interference.5. With relay indicator light, easy to view the working status of the relay.6. With relay selection jumper, it is convenient to choose other pin control relays of Raspberry Pi.Specification:Material: PCB Size: about 9.2*5.8*3cm/3.62*2.28*1.18inchColor: shown as picturePackage List:1 * Expansion BoardNote: For Raspberry Pi has 40Pin and 26Pin interfaces, and the product is only compatible for 40Pin Raspberry Pi.