Wireless Quad-band GSM/GPRS/GPS Shield Arduino Based on SIM808 Onboard CP2102 MIC29302 Phone talk speaker Module @XYGStudy GSM/GPRS/GPS Shield (B) is an Arduino shield based on the Quad-band GSM/GPRS/GPS module SIM808. Arduino connectivity, compatible with UNO, Leonardo, NUCLEO, XNUCLEO Onboard USB TO UART converter CP2102 for UART debugging 5 x LEDs for indicating the module working status Onboard voltage level converter, supports both 3.3V and 5V systems