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 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: 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.