The world's lightest and smallest mobile printer. This wireless printer easily prints from tablets, smartphones and computers. Built-in battery, Rechargeable by USB or AC adapter. this Epson printer is designed for use with only genuine Epson-brand cartridges. Other brands of ink cartridges and ink supplies are not compatible and, even if described as Compatible, may not function properly or at all. Epson provides information about the design of the printer on the box and in many other locations and materials Included with the printer and on the website. epson periodically provides firmware updates to address issues of security, performance, minor bug fixes and ensure the printer functions as designed. This printer was designed to work only with genuine Epson ink cartridges and some updates may affect the functionality of third party ink. Non-epson branded or Altered Epson cartridges that functioned prior to a firmware update may not continue to function.