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At the heart is a powerful GSM cellular module (we use the latest SIM5320E) with integrated GPS. This module can do just about everything Quad-band 850MHz GSM£¬ 900MHz EGSM£¬ 1800MHz DCS£¬ 1900MHz PCs - connect onto any global GSM network with any 2G SIM. This is the European Version - with dual-band UMTS/HSDPA 900/2100MHz WCDMA + HSDPA (Click here for the American frequency band version) Fully-integrated GPS (Qualcomm PM8015 GPS) that can be controlled and query over the same serial port Make and receive voice calls using a headset or an external 8Ω speaker + electret microphone Send and receive SMS messages Send and receive GPRS data (TCP/IP£¬ HTTP£¬ etc.) AT command interface can be used with 300£¬ 600£¬ 1200£¬ 4800£¬ 9600£¬ 19200£¬ 38400£¬ 57600£¬ 115200£¬ 230K£¬ 461K£¬ 961K£¬ 3.2M£¬ 3.7M and 4.0Mbps Native USB support - plug it into a computer and you'll get serial ports for AT commands£¬ GPS NMEA as well as a modem (note we've only tried out the AT&NMEA ports on Windows) Here's the GPS specifications: 16 acquisition channels GPS L1 C/A code Sensitivity Tracking: -157 dBm Cold starts : -144 dBm Time-To-First-Fix Cold starts: 100s (typ.) Hot starts: 1s (typ.) Accuracy: approx 2.5 meters