802.11b/g wireless USB adaptor chipset : Ralink RT2571 +RT2528 host interface : USB 2.0/1.1 Peak throughput : 54Mbps Antenna : Builted -in PCB antenna Frequency: 2412~2483.5 mhz Security: WEP 64/128,WPA,WPA2,802.1X,Cisco CCS V1.0,2.0 and V3.0 compliant Operation system: Windows CE/2000/XP/Vista;Linux;Mac OS X Unit size : 67 x 21 x 8.5 mm; unit weight: 14g