More models are available TK102: B0087N8MJSTK102B: B00AH8JUWYTK103: B00AHTDL9QFeatures: 1. Support both GPS & LBS (Location based service). 2. Support SMS/GPRS/Internet Network data transmission (GPRS/Internet instructions includes in CD in package）3. Support GPRS on-line and GPRS re-connected automatically if GPRS drops. 4. Support SMS / GPRS dual-mode switching. 5. Support configuration by remote terminal. 6. Support for point-to-point, point to group, group-to-group monitoring.7. Set multiple functions of security, positioning, monitoring surveillance, emergency alarms and tracking in its entirety. Main Functions: 1. Used widely for vehicle and other moving objects tracking. 2. Single Locating. 3. Successive locating automatically. 4. SOS.5. Alarm Function:Low battery Alarm; Power off Alarm;Geo-fence; Geo-fence; Movement Alarm; Overspeed Alarm 6. Cut off the oil and the power system / restore oil and power system.7. Set up the type of the door trigger.8. Check the vehicle state.Specifications: DIM: 83*54*26mm; Weight: 120g GSM/GPRS Module: SIM900B; GPS Module: SIRF3 chipGPS Sensitivity:-159dBm; GPS Start time: Cold status 45s;Warm status 35s;Hot status 1sVoltage of car power system: 12 V -24VBackup battery:Chargeable 3.7V 800mAh Li-ion batteryPackage: 1* GPS Tracker1* GPS Antenna (3M)1* GSM Antenna (3M)1* Remote Control1* Microphone( 1.5M)1* Harness1* Relay1* User Manual1* CD