HUAWEI E1550 Product Details: Specifications: Huawei E1550 USB modem. HSDPA/WCDMA 2100MHZ GSM/GRPS/EDGE 850/900/1800/1900MHZ HSDPA data transfer speed up to 3.6Mbps USB interface install automatically and easy to use Micro SD memory card slot(up to 4GB) Dimensions: size:70.1mmx25.7mmx 11.6mm weight:50g. System Requirements: windows 2000/XP/Vista or Mac OS X 128MB of RAM 50MB free hard disk space or above USB slot.