3g Dvr Gps Tracker Igv-3g6818a Support 2 Cameras 

Dim	66x111x27 mm
Weight	190g
Network	HSDPA,UMTS,EDGE,GSM/GPRS
Net frequency channel	EDGE/GPRS/GSM 850/900/1800/1900 MHz HSDPA/UMTS 850/1900 or 900/2100 MHz
Chip	SIRF3 chip
3G chip	WCDMA
GPS sensitivity	-159dBm
GPS accuracy	5m
Time to first initiate	Cold status 45s Warm status 35s Hot status 1s
Input voltage	12V-24V input
User-defined input alarm detection level	0V
Video form	MP4
Battery	Chargeable changeable 3.7V 800mAh battery
Standby	48hours
Storage temp	-40°C to +85°C
Operation temp	-20°C to +55°C
Humility	5%--95% non-condensing

IGreenView 3G GPS Tracker DMEO:





About GPS Technology Definitions:

GPS:
GPS stands for Global Positioning System. It is a navigation system that uses a network of 24 satellites orbiting the planet to provide location and time information anywhere on earth. The system sends signals to and from the satellites to your GPS device and uses this information to calculate your position. The software in your GPS receiver can take this information and combine it with map data to display your position. The technology also enables you to plan routes, find out about nearby locations and approximate your speed and journey time.

GPS tracker:
A GPS tracker uses the global positioning system to provide information about the location of someone or something. The tracker can be fitted in a car, or attached to a person or asset, and record its location data. The recorded data can be stored within the tracking unit itself, or may be transmitted to a central location. The data can be used to provide valuable information, such as distance travelled, speeds and locations reached.

GSM (quad band):
GSM stands for Global System for Mobile communications and is used for transmitting voice and data services on mobile phones. GSM supports voice calls and data transfer speeds of up to 9.6kbps, as well as the transmission of SMS (Short Message Service) texts. A quad band GSM refers to a device that can use four different frequency bands, enabling you to use different mobile phone networks around the world.

GPRS:
GPRS stands for General Packet Radio Service. It is a mobile service that can be found on second generation (2G) wireless technology, such as mobile phones. Among other things, a GPRS Subscriber Identity Module (SIM) card enables a mobile device to be constantly connected to the Internet and transmit multimedia messages, such as images, video, audio and text, or a combination of these.