Warranty - We provide 1-Year Service( 45 days free return and 12 month free replacement). We do new pcs replacement for any problem of wifi adapter, you just need email us. We will respond to your within 24 hours.Please contact us first if you have any problems about the usb wireless network adapter. Easy Setup and Online Setup Technical Support: First, install the driver from CD ( included in the package ). Second, plug this wifi adapter into your computer. Install Driver Tips : If the CD can not be used or you don't have CD DRIVER, please feel free to email us for support. We will respond to your within 24 hours, thanks!. USB 3.0 Fast Transmission: Excellent transfer speeds with usb 3.0 wifi adapter, USB 3.0 transfers data up to 10x faster than USB 2.0 and also compatible with USB 2.0, USB 3.0 upgrades laptops desktops and computer to AC1300 WiFi speed enables smooth HD streaming and fast download. High Gain Dual-band Antenna: USB wifi antennas adopted dual band 5G/2.4G 5dBi antenna, 5Ghz wifi speed up to 867Mbps,2.4GHz 400Mbps. Advance WiFi chip 8812BU bring faster speed and more stable signal for gaming, and streaming online is much more enjoyable without buffering or interruptions. Wide Compatibility: PC WiFi adapter support Windows 10 / 8 / 8.1 / 7 / XP / Vista ( plug and play for Windows 10 ) / Mac OS 10.6 -10.15.3 for MacBook / Linux(CD installation driver included), DON'T support smart TV(for Android) ;Ultra-fast wireless network speed, make you have a non-general web experience. AC1300Mbps High SPEED USB WiFI Adapter - Dual Band WiFi Dongle, USB Wifi Adapter for PC, 802.11AC Wifi usb, up to 867Mbps on 5Ghz band or 400Mbps on 2.4Ghz band.