I have got few pieces of GPS tracker with me. It has builtin GSM & GPS antenna ,so it extremely slim and small. It has all the usual features like Engine Kill, Geo Fence, Acc on alarm, over speed alarm etc. The best thing is there is no monthly/yearly charges and you can receive car location directly on your phone via sms. It comes with built in battery and alerts if car battery is disconnected. I have installed it in my personal car and it works great. Price is 5800/
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Nauman