The Alfa AWUS036H is one of the most powerful card available. This has a stunning 1000mW output power. So if you are looking for a device to connect to an outdoor 2.4 GHz antenna, such as on a boat or an RV, this is a perfect solution. It outperforms wireless cards that are built in to newer laptops. Adding this to your laptop or desktop computer will enhance range and signal quality at longer distances. And works with Win98SE/200/ME/XP, Windows Vista, Windows 7, Linux (kernel 2.6.6 and later) and Macintosh (OS version 10.4). And the necessary drivers for ALL of these operating systems are included on CD-ROM Connects at a full 54Mbps via USB 2.0, up to 8 times faster than a USB 1.1 adapter High gain upgradeable Compact size for greater flexibility Also compatible with USB 1.1 desktop and notebook computers Plug-and-Play Compatible with windows 98SE, 2000, Millennium, XP and Linux High security 64/128/256bit WEP Encryption, TKIP, WPA, 802.11 Data Rate 802.11b: UP to 11Mbps, 802.11g: 54Mbps Antenna Type 1 x 2.4Ghz SMA connector Chipset Realtek 8187LOutput Power 24dBm (OFDM), 30dBm(CCK)Frequency Stability within +25 ppm Data Modulation Type BPSK,QPSK, CCK and OFDM Security WEP 64/128, 802.1X support, Wi-Fi Protected Access (WPA), WPA-PSK ,WPA II .Dimensions 8.5 x 2.2 x 6.3cmWeight 38.5gFor MAC OS 10.6.7 and later version, we suggest AWUS036NHR, AWUS036NH, WUS036NEH, AWUS051NH. Not Compatible with Windows 8.1.