... includes the standard RS-232, Digital Audio,External reset control, parallel LCD Display, Keypad, Ringer extension ... Frequency Interval 45MHz for CellularVocoder EVRC, 13kQCELPRF technology Zero Intermediate FrequencyNumber of Channel 832 for CellularOperating Voltage VBATT_INT ... RS-232s, Digital/Analog Audios, LCD, Keypad, RingerExternal Reset Control, R-UIM, MP3, MIDI, GPIOs, USBUser Interface ...