Fully-integrated GPS Send and receive SMS message AT command interface with "auto baud" detection GPS L1 C/A code 22 tracking /66 acquisition channels Tracking: -165 dBm The SIM808 GPS/GPRS/GSM Arduino Shield is based on the SIMComm SIM808 all-in-one cellular phone module. Compares to the SIM900 Shield, the SIM808 Shield integrate the GPS function, which makes it more convenient and cost-effective for mobile applications such as cargo monitoring, that you can add location-tracking, voice, text, SMS and data to your project. Features: Cold starts: -148 dBm Accuracy: approx 2.5 meters Send and receive GPRS data (TCP/IP, HTTP, etc.) Make and receive voice calls using a headset or an external 32Ω speaker + electret microphone Time-To-First-Fix：Cold starts-32s (typ.)，Hot starts-1s (typ.)，Warm starts-5s (typ.) Quad-band 850/900/1800/1900MHz - connect onto any global GSM network with any 2G SIM (in the USA, T-Mobile is suggested)
