DFRobot SIM 908 GPS/GPRS/GSM Shield for Arduino This is an SIM908 Arduino GPS/GPRS/GSM shield from DFRobot This shield with a Quad-band GSM/GPRS engine works on frequencies EGSM 900MHz/DCS 1800MHz and GSM850 MHz/PCS 1900MHz It also supports GPS technology for satellite navigation It's possible for your robot and control system to send messages and use the GSM network The design of this shield allows you to drive the GSM & GPS function directly with the computer and the Arduino Board