Get Better Wi-Fi on your Mac BearExtender 1200 for Mac is a long range, high power 802.11n USB WiFi Antenna that offers 2-4x the range of your Mac"s built-in Wi-Fi. See rave reviews from MacWorld, TUAW, Engadget and more. Maximum 1200mW RF output power BearExtender technology combines a high sensitivity receiver with a powerful 1200mW transmitter for long range Wi-Fi at an affordable price. An upgradable external antenna cuts through interference and can be upgraded easily for even longer range. Both a 2 dBi and higher gain 5 dBi antenna are included. Made for Mac BearExtender was originally designed to help students with Apple computers at the University of California, Berkeley, connect to the campus wide Wi-Fi network called "AirBears". BearExtender 1200 is compatible with Mac notebook and desktop computers running Mac OS X 10.5 through 10.8 Mountain Lion. A 10.9 Mavericks beta is available at BearExtender.com/support Note: BearExtender 1200 is not compatible with Microsoft Windows. Please check Amazon for "BearExtender PC" instead. Plugs into USB BearExtender 1200 is not a wall repeater so it does not require access to a power outlet. It plugs directly to your Mac using the included USB cable to boost the range of your Mac whether you are at home or traveling. Use BearExtender 1200 to get better Wi-Fi reception on your Mac in hotels, airports, libraries, or while relaxing out back by the pool. It is great for use on RVs or boats! Long Range 802.11n Wi-Fi BearExtender is also a great way to add 802.11n wireless networking capability to an older Apple computer. It is backward compatible with 802.11b/g networks.