802.11n wireless USB adaptor . Chipset : Ralink RT2770 + RT2720. Host interface : USB 2.0/1.1 Peak throughput : 300Mbps. Antenna : Builted -in PCB antenna (1T2R). Frequency: 2412~2483.5 mhz Security: WEP 64/128,WPA,WPA2,802.1X,and 802.11i Cisco CCS V1.0,2.0 and V3.0 compliant.Operation system: Windows CE/2000/XP/Vista;Linux;Mac OS X . Unit size : 86.6 x 25 x 10.5mm ; unit weight : 16g