Control Via AT Commands Supply voltage range: 3.4V~ 4.2V Operation temperature: -40 to +85 Dimension: 30 X 30X 2.9 mm Specifications for Data transfer HSPA+ Max. 14.4Mbps(DL), Max. 5.76Mbps(UL) WCDMA Max. 384Kbps(DL), Max. 384Kbps(UL) EDGE Class: Max. 236.8Kbps(DL), Max. 236.8Kbps(UL) GPRS Max. 85.6Kbps(DL), Max. 85.6Kbps(UL) Specifications for SMS Point to point MO and MT Text and PDU mode Other features USB Driver for Microsoft Windows 2000/XP/Vista/7/8 USB Driver for Windows CE/Mobile USB Driver for Linux/Android Firmware update via USB Embedded AT