Before Using Wifi Adapter, Please Read this below: 1. Support Systems: Win10/8/8.1/7/Vista/XP/2000, Mac OS X 10.6-10.13 ,Not support Linux, TV, Projector, Printer 2. Standard: IEEE 802.11 b/g/n 2.4GHz, IEEE 802.11 a/n/ac 5.0GHz ,Built -in Antenna, USB 2.0 3. 600Mbps Wifi adapter\'s max speed is up to 433Mbps when you connect to 5G band, While it tops out at 150Mbps in 2.4G. Normally, your PC\'s network speed can\'t up to the wifi adapter\'s speed as it depends on many factors, Such as your network size, router, barriers, laptop or PC \'s internal memory. 4. This 5 Ghz mode stands out within short range. If your WiFi adapter is closed to the router, then wifi signal will be stronger under 5 GHz than 2.4 GHz . Now You want to have fast speed in watching video and playing online games, We suggest that you should connect to the 5G band. If your WiFi adapter is far away from the router, and you just want to surf the website, you’d better connect to 2.4G band for better and stable signal. 5. It is different for the program between our usb wifi adapter with notebook\'s built-in netword card, The ablity to receive wifi for notebook with built-in network card is no stronger than mobile phone, While external network card is not better than notebook. The same router, From the ablity to receive wifi, the speed of the phone will be faster than computer. 6. If the wifi adapter stop working suddenly, Please unplug and replug the wifi adapter and then reinstall the driver or update the driver manually. 7. If the connection is unstable, please check your signal strength and signal channel. 8. If you meet a problem about the driver cannot be installed on Mac 10.13.3 or Mac 10.13.4 system, please follow the suggestion steps to resolve the problem; 1.Find out \"System Preferences\" > 2. Click \"Security and Privacy\" 3. Then click \"Allow\"