The World’s Smallest Mobile Color Printer This printer with a permanent ink cartridge which with electrothermal principle that can be used after charging! What is electrothermal principle? After the power switch is turned on, the air ink is ejected to the blast by the instant heating (400 degrees/millisecond) of the thermistor, and the ink is emitted. Air Ink – Raw materials extracted from contaminated components in the air! We have applied for patent protection for this technology!