GPS tracker of best cost performance/manufacturer from China/Security products/car managements

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Dear sirs, 

We are one of the most professional GPS tracker manufacturer in China, we have a big engineer team with more than *0 software engineers. And we can make software according to customers' specific requirements,and our platform are free for user to use all the time. 

For different people and car, we have different solutions, i believe there must be one which suitable for you. 
Bellow is the basic feature:
Personal tracker:
●Tracking via SMS or GPRS (TCP)
● Current location report
● Tracking by time interval
● Two-way conversation
● Voice monitoring 
● Geo-fencing control
● Low battery alert
● Speeding alert
● Alert when trackerenters/exits GPS blind area
● Alert when tracker is turned on.
● Motion sensor inbuilt for power saving
● Three s for making phone call and/or sending message
Vehicle tracker:
●Regular support continuous tracking control function
●Supporting SMS and Internet inquires the location information
●Supports remote monitoring function
●Support SOS alarm function
●Support ACC condition monitoring
●Supports remote fault oil power function
●Support electronic fence (a/the boundary) alarm
●Support terminal low battery alarm
●voltage: 6V**2V
●with G-sensor built in 

Here is my e-mail ID: *@********************r> If you get interest, pls kindly e-mail me, I'll send the detailed products info. for your reference. 

Thank you in advance for your trust and time.

Regards,
Suey