GPS GPRS SMS Real-time tracker TK103A Quad band SD card slot anti-theft move alarm by SMS Applications: Global positioning Real-time monitoring Vehicle locating Timing tracking Cutting off power and oli by remote control Vehicle rental / Fleet management etc Dual mode positioning means double safety for kids. Achieve all day real-time location tracing ,check the position at anytime anywhere . You can track the location via SMS, website, iOS or Android APP Real time tracking Quadband GSM frequency; google maps link Free PC software. 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. Support SMS / GPRS dual-mode switching; Support GPRS on-line and GPRS re-connected automatically if GPRS drops. If you have problem in installation, please search TK103A on Youtube, there are many helpful videos. 2G SIM CARD IS REQUIRED.Mini size, easy install; Chargeable 3.7V 800mAh Li-ion battery built in- Dim: about 8.3 x 5.4 x 2.6cm, Weight :Approx.120g.