Product restrictions: this product is specially designed, difficult to assemble, limited in size compatibility, and can only be purchased as specified by professional engineers. Please confirm your notebook space restrictions on the annual product specifications before placing an order for purchase. Brand , excellent product performance, super good reputation products,100% power test delivery. Portable & convenient: The usb c to ssd adapter is small and , easy to carry and store. you can take it with you when you go out. High efficiency: This ssd converter is designed with high efficiency, which can effectively reduce the loss of data. Product model:WK5 Product Name:M.2 B-key WWAN 4G network card slot to USB3.0 interface adapter board Adapter board specifications:M.2 B-key WWAN interface, size 30x42mm, adapter board supports USB 3.0 Applicable equipment:USB wireless card, USB mouse receiver, USB SSD Product use:can make the notebook empty 4G network card slot to USB 3.0 interface, this product for transfer use NOTE:This product is only an adapter board and does not include demonstration equipment such as wireless network card and hard disk. Summary of technical issues: 1. What is the size and length limit for USB devices? The length of the U disk must be within 28mm, and it cannot be installed beyond 28mm 2. What are the size and thickness limits for USB devices? The thickness of the adapter board is 5.8mm, and whether it can be installed depends on the thickness of the U disk and the space of your notebook Colour:As Shown Material:PC+Metal Package Contents: 1 * Converter 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.