1. Frequency HSDPA 2. UMTS 2100MHZ 3. EDGE / GPRS / GSM 4. 850/900MHz; products features 1. Frequency HSDPA / UMTS 2100MHZ / EDGE / GPRS / GSM 850/9003. Plug &Play (Auto installation)4. Micro-SD slot (Expandable up to 4GB,use as memory stick)5. Internal Antenna6. Phonebook Function,SMS Function7. System Support:Windows 2000/ XP, Vista, Mac OS,Windows 7