We have been in gps tracker for 4 years,there is a strong technology engineer in software and hardware.The product has been certificated by CCC and Rohs,the product including gps tracker ,gps tachograph ,gps navigation and gprs printer.What we can guarantee is 24*7 hours tech support,when there is a problem we would help you solve it even at mid-night.Customers&＃39;s satisfy is power for us,Quality is our guarant ,win-win is what we pursued.