1. Suitable for 4B M.2SSD, solid state drive expansion board, 2. Faster and smoother, expanded support for M.2 solid-state drives, making for 4B run faster and smoother. Enables faster boot times and larger storage capacity 3. Supports 2280NVME protocol solid state drive, supports for 4 positioning hole size, and is powered by USB interface 4. Not all for versions support USB boot, and the configuration methods are also different. 5. If you do not use a for , it can also be used directly as a USB solid-state drive box. 1. Product name: for 4B M.2SSD solid state drive expansion board 2. M.2 M-Key: Extended support for M.2 SSDs 3. SSD function: supports SSD hard disk boot system and storage expansion; only storage expansion 4. LED indicator light: power indicator light, solid state drive status light 5. Model: for 4B M.2 PCIE Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:As Shown Material:PCB Package Contents: 1 x SSD Expansion Board 4 x (m2.5 x 6+4) Copper Pillar 1 x USB3.0 Connector 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.