Features: Brand new and high quality Full-function expansion: This expansion board provides a full-function GPIO expansion capability for RPi, and users can easily connect and control various external devices and sensors. Test board design: As a test board, it provides rich interfaces and pins for developers to test hardware and learn the related functions for RPi Strong compatibility: the expansion board is perfectly for RPi, and can be directly inserted without additional connecting wires or adapters. Rich interfaces: The expansion board is equipped with multiple GPIO pins, UART communication ports and I2C interfaces to meet the connection requirements of different peripherals and sensors. Simple installation: the expansion board uses the standard 20pin bus interfaces, which is simple and convenient to install, and is suitable for rapid construction and disassembly of different projects. Specifications: Material:PCB Package Includes: 1x Expansion Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.