gps Tracking software, gps tracking hardware, gps gsm software Listen-in Two-way Audio Inbuilt Tremble Sensor SOS help gps Tracking software, gps tracking hardware, gps gsm softwareFeatures ... or GSM 850/900/1800/1900MhzGPS Module: latest GPS SIRF-Star III chipsetGPS Sensitivity: -158DbGPS Frequency ... lights to show GPS/GSM working status.Interface: 5 digital inputs, 3 negative and 2 positive triggering ...