For dual band WiFi , one network card has two frequency bands, which one you want to to. To watch high-definition video and play online games on-demand, please 5GHz WiFi frequency band with small signal interference and stable without dropping line, and avoid the 2.4GHz network frequency band blocked by network. Bluetooth technology makes it more convenient for us to various devices without being bound by various 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 quality of the wireless network card is guaranteed, and each source of supply has been by our quality inspection. Specifications Network card chip: Atheros AR5B22 Standard protocol: IEEE 802 1 1b/a/ Wireless frequency band: 2.4G-5G Bluetooth: 4.0 system: windows 7/8/10 Version note: Universal version (not 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 products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.