... optional - SDK,customize - ODM RoHS C 7 inch GPS with GSM/GPRS, RS232, USB Host ( USB OTG, AVIN Cemara+ WIFI+ ... , ARM1136 core, 533MHz, 128M DDR.2. Built-in 4 Bands GSM/GPRS module (SimCom900 (EGSM900/ GSM1800/ 850MHz/ 1900MHz)3. Daul ... m/sHeading: < 1 degreeTTFFCold Start: < 45sWarm Start: < 30sHot Start: < 3sRILGSMGSM 900/1800 MHz or EGSM900/GSM1800/850MHz/1900MHzInternal antennafully AT Command ...