Features Specifications:802.11 b/g wifi USB network adapter with Antenna  Model: GWF-2B1T Ralink RT2571 MAC/BBP with RT2528 Transceiver, external antenna Main Features: 802.11b: 1, 2, 5.5, 11Mbps; 802.11g: 6, 9, 12, 24, 36, 48, 54Mbps Peak rate 54Mbps, Peak throughput 27Mbps Power management Certification Wi-Fi Certification: 802.11 b/g, WPA, WPA2, WMM, WMM-PS WHQL, Cisco CCX, USB-IF Hardware Chipset Ralink RT2571+RT2528  Host interface USB 2.0/1.1, type A ( 4 pin header) LEDS Link/ Acticity RF  Antenna Builted-in PCB antenna Frequency 2412~2483.5 MHz, ISM band. Transmit Power 802.11b: 19+/-1.5dBm; 802.11g: 16+/-1.5dBm; Receive Sensitivity 802.11b: -87dBm@11Mbps; 802.11g: -71dBm@54Mbps Software Operation System Windows 98 SE/ME/CE/2000/XP/Vista; Linux; Mac OS X Security WEP 64/128 , WPA, WPA2, 802.1X, Cisco CCS V1.0, 2.0 and V3.0 Compliant Operation Conditions Voltage Range DC 5.0V ± 5%  Max TX current 330mA Standby current 0.42mA Operating Temperature  0°C - 50°C Storage Temperature  -20°C - 70°C Operating Humidity  RH 95% (Non-Condensing) Storage Humidity  RH 95% (Non-Condensing) Physical Specification Dimensions 82x26x11mm(without antenna), antenna hight :51mm