The brief technical specifications: 3g modem speed wireless standard UMTS/WCDMA with USB interface and card reader microSD memory up to 4 GB.Huawei E158 supports standards: UMTS/WCDMA/GPRS/EDGE. Huawei E158 modem can receive data at up to 3.1 Mbit/s and the transfer of up to 384 kbit/s. The modem Huawei E158 has a slot for a SIM card. Fully compatible with OS Windows/MacOS. Huawei E158 Specifications :- 1. Standards support: 3G 2. Protocol version: UMTS/WCDMA/GPRS/EDGE 3. Antenna: Internal 4. Maximum downstream data rate: up to 3.1 Mbit/s 5. Maximum data transfer rate: up to 384 kbit/s 6. Frequency: 850/900/1800/1900/2100 MHz 7. Interface: USB 8. Options: 3G-modem, manual, CD-disc with the software 9. Dimensions: 82.5 x 28 x 12.2 mm