... Flash512KB with bootloader pre-installedDDR SDRAMDDR-2, 128MBRTCCPU Built-in Real Time Clock, Battery backedPeripheralsAudioMicrophone InMonoLine Out / Headphone3.5mm Jack, Stereo outputAmplifierOn ... DB9 Jack, standard RS232, or1 x 6-pin Header TTL signal level, can be used for GPRS/CDMA1X modems, GPS modules ...