There are 4 models optional,different model with different interface and appearance, please choose suitable model before purchase: (1)1300Mbps Chipset:RTL8811,2.4G & 5G,USB3.0 Interface,driver-free for Win8 and above system. (2)600Mbps Chipset:RTL8811,2.4G & 5G,USB2.0 Interface,driver-free for Win8 and above system. Please Note: The 1300Mbps rate of this product is composed of two working frequencies of 2.4G and 5.8G, 2.4G 400Mbps+5.8G 867Mbps dual-band concurrent, With four Antennas,with less interference, high speed, wide transmission distance coverage, and better wall penetration performance. We suggest you to insert WiFi USB Adapter into back USB3.0 port of your Computer,because usb port in the back can provide more power.(The USB3.0 interface on the front of some computer hosts may have insufficient power or is not supported) Product Features: 1. Dual-frequency switching, supporting two working frequency bands of 2.4GHz and 5.8GHz,The dual-band wireless rate is up to 1300Mbps (2.4