A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals.The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or internet-connected computer, using a cellular (GPRS or SMS), or satellite modem embedded in the unit.This allows the asset's location to be displayed against a map either in real time or later.
Precise time, automatic calibration time
SOS keys and 3 buttons quick dialing (default 3 telephone number) function
Support no positioning server conditions positioning: the detailed real-time mobile inquires available position        information and map information
Low battery alarm function
Built-in microphone, support monitoring function
Support electronic fence alarm
Support base station auxiliary positioning
Battery:CRT19G/ 450mAh