xternal power supply: 3V/4.5V Four-band 850/900/1800/1900MHz Support camera /MP3/ MIDI-Flash 128/256mb (class10 support), download 53.68kbits/s, Upload 26.8kbits/s data line Asynchronous transmission and synchronization up to 14,400 bits/s Automatic fax group3 (class 1&2) Call and fax conversion IrDA 1.2A protocol GPRS WAP Power supply: 3.6CDC 1A Average 300MA(0%DTX.Pmax) Idle 3.5MA External Dimensions :58.4×32.2×3.9mm Weight :11g Real-Time clock: I/O interface for handheld devices 4 bit parallel interface parallel LCD interface I2C bus 10 output lines for 5×5 keyboard 2 microphone input and 2 earphone output buzzer output Power interface: For data operation RS232C serial cable controls baud rate from 300 to 115,200 bits/s via AT command and automatic rate from 2,400 to 19,200 bits/s