Based on for CM4 design The board has a standard CM4 connector, which supports access to Compute Module 4 Lite/eMMC series motherboards and corresponding baseboards or expansion boards Physical protection Multiple plug-ins are not a problem Protect the CM4 socket to prevent damage to the CM4 connector caused by multiple physical plug-ins. It is used in environments where multiple plug-ins are required to protect the CM4 core board socket Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Blue Material:PCB Package Contents: 1*Protection 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.