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Vehicle GPS Tracker VG01U.  Features:  GPS tracking device that integrates an INS (Inertial Navigation System) to provide faster and stable access to location and position availability in weak GPS signal areas, such as an underpass, downtown, tunnel, etc. Its embedded algorithm allows managers or insurance providers to capture detailed driver behaviors. VG01U has some professional alert to analysis and driver behavior: harsh acceleration alert, harsh brake alert, sharp turn alert, harsh lane change alert, crash alert, rolling alert, vehicle drift alert, vehicle angle abnormality.  Specifications:  GSM: GSM frequency: 850/900/1800/1900MHz. GPRS: class 12, TCP / IP. Chipset: GPS+INS. Frequency: L1. Memory: 32 + 32Mb. Positioning accuracy: