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Come with good bottom design, two vents and four non‑slip feet, simple but useful M.2 expansion slot, support M.2 module such as M.2 SSD, and then connect to for Pi via USB adapter The M.2 expansion board expands the support for M.2 SATA SSD to maximize the potential speed of for 4B and utilize. Now you will be able to boot through M.2 SATA SSD to achieve faster boot time and larger storage capacity You can connect the M.2 expansion board through the USB interface and use the M.2 solid state drive as the main storage drive, which greatly improves the for Storage read and write speed Easy to assemble, just a few steps, no messy wiring, no wrong connection, more stable and safer