As more and more car thefts occur greater means of security are a must. Companies need to keep track of their work vehicles and track the workers. In the past this has been very difficult and semi trailers are often high jacked. In recent times GPS units have proven themselves in tracking and security. With this one of a kind GPS tracker you will always be able to track your vehicle and know what it is up to. This device has a large range of frequencies that it can operate with; 850-1900MHz. This device can track your vehicle in many ways; including everything from GPS to SMS to GPRS. It can be programmed via remote control and has many options for monitoring the route and destinations. With the SIRF3 chipset it is extremely sensitive and accurate to 5 meters. The GPS start up time can be as quick as 1 second to accurately load. It simply runs on your vehicles DC power supply and has a built in battery for added convenience. From its multiple antennas to its microphone; this package comes with everything you could possible need to install this great GPS system. It comes with a drivers CD and remote control. The English manual is very clear and concise. All in all this is one great unit that DX made better by offering this low price with free shipping. - Model: AJ-202 - Network band: 850/900/1800/1900Mhz or 900/1800/1900 MHz - Supports GPS/GSM station positioning - Supports SMS/GPRS/Internet network data transmission - Supports GSM/GPRS on-line & GPRS automatically re-connection - Supports SMS/GPRS dual-mode switching - Supports configuration by remote terminal - Supports point-to-point point-to-group group-to-group monitoring - GSM/GPRS module: Simcom300dor Simcom340d - GPS Chipset: SIRF3 - GPS sensitivity: -159dBm - GPS accuracy: 5 meters - GPS start-up time: Cold status 45s Warm status 35s Hot status 1s - Car power supply: DC 12~24V - Built-in rechargeable 3.7V 800mAh Li-ion battery - Package includes: - 1 x GPS Tracker - 1 x GPS Antenna - 1 x GSM Antenna - 1 x Connection cable set - 1 x JD1914 power switch - 1 x Monitor microphone - 1 x Remote controller - 1 x Driver CD - 1 x English manual