Online GPS tracking device with web platform,SOS alarm,real time tracking to secure the safety freely all the way you go. function and specifications1. Simcom GSM module2. SiRF-III high sensibility GPS module3. dual band/ quad band frequency (optional) 850,900,1800,1900MHz4. free software for parameter setting.5. vehicle power supply6.over speed alarm7. SOS emergency alarm (optional with ...