Personal Car GPS Tracker GPS tracker+Handsfree We offer one year warranty. Personal Car GPS Tracker Platform: MTK6223+SIRF3Band: GSM900/DCS1800/PCS1900 or GSM850/DCS1800/PCS190Internal Battery: Rechargeable and removable 830 mAh battery (3.7V)GPS Sensitivity -158dBBuilt-in internal antennaHot start 1 sec., averageWarm start 38 sec., averageCold start 42 sec., average