Product name: CM4 expansion board Model: CM4-IO-BASE-C CM4 deck: suitable for all versions of Compute Module4 Networking: Gigabit Ethernet RJ45 interface Connector: M.2 M KEY, support communication module or NVME SSD, for Raspberry Pi 40PIN GPIO interface USB: USB2.0 Type A x 2 Display: LCD interface (40pin 0.5mm FPC connector) Camera: MIPI CSI-2 interface x 2 (15pin 1.0mm FPC connector) Video: HDMI-compatible interface, support 4K 30fps output Real Time Clock: RTC real time clock with battery interface and ability to wake up CM4 Storage: Onboard Micro-SD card slot (for versions without eMMC) Fan interface: adjustable speed, 5V Power input: 5V Size: 85 x 56mm (for Raspberry Pi size) Depending on the batch, there may be differences in product appearance, color, and printed text, which will not affect use. Material: PCB colour: blue Package Contents: 2 x CM4 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.