Attributes : 8,16x2 Character,2 Digit,4 General Purpose Keys,2x2 Matrix,I2C And SPI Based,Stepper Motor And DC Motor,Available,2,Serial RS-232,AT Commands,30 To 115,200 Bits/s,12V SMPS,SIM800,Metal Enclosure Case,Not Specified,Not Specified,Experimentation With GPIO D