... 11)have a dust filter inside, filtering Sundries, dust ect .12)light weight, have castors in the bottom , move conveniently . ... speed.19)Energy saving ,had multi-function as air anion ,air humidifier and air purifier ,no fluorine pollution,friendly to the environment. ... wind, sleep wind and normal wind for your choose. 12)Long distance remote control.13)Refrigeration, humidification. Power cord ...