• World’s smallest USB MU-MIMO Wi-Fi adaptor
  Super-fast Wi-Fi in a nano-sized package that’s small enough to leave plugged in!
• Instant Wi-Fi upgrade for laptops
  Enjoy 802.11ac Wi-Fi speeds.
• Perfect for streaming and gaming
  Dual-band support gives you the 5GHz frequency band for smooth 4K UHD streaming and low latency gaming.

3 years warranty
https://www.asus.com/Networking/USB-AC53-Nano/