The WWAN M.2 KEY-B slot provides an expansion USB 3.0 port, perfect for connecting mini-USB devices. Product Name: M.2 B-key WWAN 4G network card slot to USB3.0 adapter 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. Interface: M.2 KEY-B WWAN to USB 3.0 Input Interface: M.2 KEY-B (requires M.2 with USB 3.0 signal) Interface Speed: USB 3.0 5Gbps (depending on motherboard output) Supported Dimensions: KEY-B 30*42mm/30*52mm Function: Directs the motherboard's M.2 USB signal to the USB connector. Supported Systems: 10/11/2003/Linux Notes: How it works: Laptop M.2 4G or 3G network cards contain built-in USB 3.0 signals and 3.3V power. This product directs the USB signal to the USB connector and boosts the 3.3V to 5V/1A to supply USB devices. As mentioned above, since the USB signal is output from the computer, some computers may misinterpret this signal or not output it at all, causing this card to fail. This is not a problem with the card itself. This card cannot be used if the internal USB bridge is damaged. It is only suitable for the WWAN M.24G network card (KEY-B) interface, and cannot be used with the or NVME protocol interface. Pre-purchase Notice: M.2 slots look the same. Before purchasing, please confirm whether your motherboard has a dedicated 4G/3G network card slot (usually for a 4G network card). This product is only suitable for 4G network card applications and cannot be used with other interfaces! Color: Black Material: PCB Package Contents: 1*M.2 B Key to USB3.0 Adapter 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.