External power supply: 3V / 4.5V SIM data characteristics: four bands 850/900/1800 / 1900MHz support camera / MP3 / MIDI-Flash 128 / 256mb, automatic fax group3 (class 1 & 2) call and fax conversion IrDA 1.2A protocol GPRS WAP power supply : 3.6CDC 1A Communication Average 300MA (0% DTX.Pmax) Free 3.5MA External Dimensions: 58.4 × 32.2 × 3.9mm Weight: 11g Real-Time Clock: Designed for Handheld Devices I / O Interface 4-Bit Parallel Interface Parallel LCD Interface I2C Bus 10 output lines for 5 × 5 keyboard 2 microphone inputs and 2 headphones output buzzer output Power interface: for data operation RS232C serial line through AT command control baud rate from 300 to 115,200 bits / s automatic rate from 2,400 To 19,200 bits