Power Supply: +9V to +40V Power Consumption For VBATT: Active mode (peak) < 1.0A Active mode (avg.) < 300mA Idle mode< 50mA Sleep mode< 5mA Operating Temperature Range:-20¡ãC to +60¡ãC Storage Temperature Range: -20¡ãC to +70¡ãC Humidity :Up to 75% non-codensing External Antenna: Connected via the 50 Ω coax. connector External SIM Card: Connected via SIM Card connector SIM card type: 3V Transmit Power: Class 4 (2W) for E-GSM 900 and 850 Class 1(1W) for DCS 1800 Class 1(1W) for PCS 1900 Sensitivity: -104 dBm minimum for E-GSM 900 and 850 -102 dBm minimum for DCS 1800 (3)-102 dBm minimum for PCS 1900 Speech Codec : Triple rate Codec Half rate -ETS 06.20 Full rate -ETS 06.10 Enhance Full rate-ETS 06.50/06.06/06.08 GPRS: Multi-slot Class 8(4Rx , 1Tx , 5 slot Max.) Support all 4 coding schemes(CS-1, CS- 2, CS-3 and CS-4) Maximum download speed is 85.6kbps Maximum upload speed is 21.4kbps Circuit-Switched Data Rate:14.4kbps Interface : Full duplex 3V CMOS-level Serial interface for AT commands protocol Dimensions: 79.0 * 48.0 * 24.0 (mm) we include a free water proof cover