Features: Fast Data Connection: Equipped with RJ45 Ethernet port for consistent quick data transfer, overcoming bandwidth limitations of standard expansion boards, ideal for industrial IoT and high data usage applications. Features gigabit networking capability for enhanced performances. Multi Port Design: Incorporates USB 2.0, camera/display, and small video ports for efficient accessory associations, simplifying setup processes for smart devices and media testing equipment. Provides comprehensive connection option. Compact Size: All models feature reduced dimensions matching CM4/CM5 modules, maximizing space utilization for embedded systems, automation, and IoT projects with strict size requirements. Maintains excellent port density. Wide Compatibility: Fully supports Compute Module 4 and CM5 series, working with both storage enabled and basic configurations, using a sturdy BtoB connector for smooth hardware changes without extra wiring. Ensures broad device integration. Versatile Expansion: Provides full 40PIN GPIO accessibility, functions with common add on boards, enabling I2C, I2S, SPI protocols to link sensors, control units, displays, and other components for flexible project development. Supports multiple communication standards. Specifications: Materials: PCB + electronic components Size: 55x40mm styles: Expansion Plate A, Expansion Plate B, Expansion Plate C(optional) Package Includes: 1PC Expansion Board note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.