Features: 100% brand new and high quality Support both GPS / GSM station positioning ways. Support SMS/GPRS/Internet Network data transmission (GPRS/Internet instructions in CD enclosed). Support GPRS on-line and GPRS re-connected automatically if GPRS drops. Support SMS / GPRS dual-mode switching. Support configuration by remote terminal. Support for point-to-point, point to group, group-to-group monitoring. Set multiple functions of security, positioning, monitoring surveillance, emergency alarms and tracking in its entirety. Specification ModelTK103A Weight120g Dimension: 83*54*26mm Network: GSM/GPRS Band: 850/900/1800/1900Mhz or 900/1800/1900Mhz GSM/GPRS Module: Mediatek chip GPS Module: Ublox chip GPS Sensitivity: -159dBm GPS Accuracy: 5m GPS Start time Cold status: 45s Warm status: 35s Hot status: 1s Voltage of car power system: 12 V -24V Backup battery: Chargeable changeable 3.7V 800mAh Li-ion battery Storage Temp: minus 40C to plus 85C Operation Temp: minus 20C to plus 65C Humidity 5%--95% non-condensing Package Included: 1 x TK103A GPS Locator Tracker 1 x Microphone Some Wiring 1 x GSM Aerial 1 x Relay 1 x User Manual 1 x Software CD 1 x GPS Aerial