Clear 4G+ Mobile USB: Series S Requires Activated 4g+ Mobile Internet CLEAR service Use it on your laptop, netbook or desktop, PC or MAC Windows, XP (SP2 and Higher) Vista, (32 & 64 bit) Windows, 7 (32 & 64 bit) Mac OS X 10.5 Leopard & Mac OS X 10.6 Bands supported: 1x EVDO Rev A 850/1900 MHz and WiMAX 2500 MHz