T-Mobile Jet Laptop Stick, Black (T-Mobile) USB modem offering connectivity for your PC to T-Mobile's 3G broadband and EDGE cellular networks Unlimited Wi-Fi access via nationwide T-Mobile HotSpot locations (using your PC's Wi-Fi connectivity) MicroSD memory card slot accepts optional cards up to 8 GB Connect to VPN networks Compatible with Windows XP/Vista; Mac OS X 10.4 (Leopard) and later