• GPS Chip: SIRF III chip
• Network: GSM / GPRS
• GSM Frequency: 850 / 900 / 1800 / 1900
• GSM/GPRS Module: Simcom Sim340
• GPS Sensitivity: -159 dBM
• GPS Accuracy: 5 M
• Time to First Fix: 
  -Cold status: 45s 
  -Warm status: 35s 
  -Hot status: 1s
• Power Supply: 12V Automotive Battery
• Backup Power: Built-in Rechargeable 3.7 V 1000 mAh Li-ion Battery
• Backup Power Battery Life: 80 hours standby
• Working Temperature: -20 to 55 C
• Humidity: 5% to 95% non-condensing
• Altitude Limit: 18,000 meters (60,000 feet) max
• Velocity Limit: 515 meters/second (1000 knots) max
• Acceleration Limit: Less than 4g
• packing saiz:19.1*13*5.8(CM)