For dual band WiFi , one network card has two frequency bands, which one you to connect to. To watch high-definition video and play online games on-demand, please use 5GHz WiFi frequency band with small signal interference and stable without dropping , and avoid the 2.4GHz network frequency band blocked by network. Bluetooth technology makes it more convenient for us to connect devices without being bound by data lines; it can be used for multiple time connection, which is a simple and convenient for short-distance wireless communication between two devices Interface type: mini pci-e Transmission rate: 300Mbps The of the wireless network card is guaranteed, and each source of supply has been by inspection. Specifications Network card chip: Atheros AR5B22 Standard protocol: IEEE 802 1 1b/a/ Wireless frequency band: 2.4G-5G Bluetooth: 4.0 Compatible system: windows 7/8/10 Version note: Universal version (not compatible with BM computers) Colour: white + green Material: PCB Size: 3 x 2.6cm Package Contents: 1 x wireless network card Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.