Wide compatibility: suitable for 2B/3B/3B+/4B/ZERO and other models (the product does not include the motherboard). Concise and clear identification: The pin definition stickers clearly indicate the functions of each pin for correct connection. Industrial terminal design: High-quality industrial terminals stable and reliable connections and are suitable for application environments. Easy to install: The installation between the expansion board and the motherboard is simple and quick, and it is easy to disassemble and replace. Space optimization: The compact design saves space and is easy to integrate into projects. This for industrial terminal GPIO pin expansion board is equipped with pin definition stickers, which is convenient for customers to use industrial terminals for pin expansion. The stickers indicate the functions of each pin, making the connection easier. At the same time, the GPIO line pins of the for are retained. It does not affect the insertion of other modules. [Application scenarios] Automation control system: connect sensors and actuators to realize data acquisition and equipment control. Internet of Things projects: connect for with other hardware devices to realize remote monitoring and control functions. DIY electronic projects: facilitate developers to realize the connection and communication between and other electronic components. This product does not include for motherboard, does not include for 4B. Note:due to different production batches, the appearance printing is different, which does not affect the use. Colour:As Shown Material:Plastic Package Contents: 4 x Expansion Board Only the above package content, other products are not included. Note: Light reflection 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.