Sourcingbay Vehicle Car GPS Tracker 103A GPS/GSM/GPRS System Quad band Real-time Google Map Tracking Mini Black SOS, Alarm/ Disarm by SMS, Vehicle locating , Vehicle rental / Fleet management etc Support SMS / GPRS dual-mode switching; Support GPRS on-line and GPRS re-connected automatically if GPRS drops(please set up the password containing number and symbolic, &gt;=6 digits) Chargeable 3.7V 800mAh Li-ion battery built in. Mini size, easy install. Dim: about 3.27 x 2.13 x 1.02 inch, Weight :Approx.0.26 Ib Call the SIM card number, you will get the current location position via google map .Send Address+Password to the SIM card number , you will get the current location position detail address This GPS tracker need to use a local sim card for 2G network, 850/900/1800/1900MHZ(sim card not included). Such as, E.g. 2g sim card from SpeedTalk Mobile, H20 and other select prepaid carriers. Kindly notice: recently some sim card carrier have dropped 2G service, please confirm if your area can use 2g network sim card long time. thanks