GPS SMS GPRS tracker GPS303C TK303C listen in waterproof IP66,9-40v TK103A same Automatic update positions of vehicle turns, LBS+GPS location,Cut off oil/power remotely,Storage and Data load,SOS Alert Sleep mode by time or shock sensor, deep sleep by shock sensor forward the third parties' message Fuel less or theft alarm, alarm without GSM networkVoice monitor,waterproof IP66 Free PC installation GPRS tracking&monitoring software Coban original provide 3 years warranty