Siemens Cinterion TC35i. Modem speed: 14.4 Kbit/s, Interface: GSM 900/1.800 MHz. Operating temperature range (T-T): -20 - 70 °C, Storage temperature range (T-T): -40 - 85 °C. Dimensions (WxDxH): 65 x 74 x 33 mm, Weight: 130 g