BearExtender 1200 Mac USB WiFi Signal Booster Antenna Award Winning Wi-Fi Booster for Macs Works with Mac OS X 10.6 through 10.9 Mavericks only. Drivers available for download at BearExtender.com/support ;. Not Mac OS X 10.10 Yosemite Compatible 4 Star Rating from MacWorld for BearExtender Technology 1 Year Warranty, 100% based US Technical Support Team 802.11b/g/n 1200mW (1.2 Watt)High Power USB Booster for Macs