ExtremTrac Technology Co.,Ltd ,headquartered in Shenzhen ,china .established in 1998,its predecessor a military group for land survey technology ,is a research group and manufacturer, specializing in GPS Tracking System .Telematics ,and software, A variety of GPS systems come out and support all fields of applications :vehicle tracking for car fleet management ,personal tracking for workforce management security ,assets / equipment tracking etc.solution .Extremtrac is also an AVL solution Provider for worldwide services in Fleet Management ,Location Based Services ,Machine-to-Machine applications .