A movable device includes: at least one lift generating unit for generating a pressure difference between opposite sides thereof to generate a lift force; a movable device body connected to the lift generating unit to be movable by the lift force generated by the lift generating unit; and at least one supply duct, the number of which corresponds to the number of the lift generating unit. One end of the supply duct is disposed on one side of the lift generating unit and, when the lift generating unit operates, fluid is suctioned through the other end of the supply duct to be supplied into the lift generating unit.

An apparatus for sterilizing an interior of a vehicle using a drone, may include a drone body of the drone and including a conformation sensor; one or more propellers coupled to the drone body; a UV unit coupled to the drone body and configured to radiate UV light; a sterilizer spray unit mounted to the drone body and configured to spray a sterilizer through the propeller; and a controller electrically connected to the UV unit or the sterilizer and configured to set a flight route in a vehicle, determine an infected region in the set flight route, and operate the UV unit or the sterilizer unit in correspondence to the infected region.

An electrostatic cleaning device includes: a flying portion having a body, at least one power source, at least one extension extending from the body, defining a hollow interior, at least one propeller configured to generate lift for the electrostatic cleaning device located at an end of the at least one extension, and at least one electrical connection extending through the hollow interior, connecting the power source to the propeller. An associated spray system includes a tank mounted to the flying portion and configured to store a cleaning spray, at least one spray mechanism in fluid communication with the tank to discharge the cleaning spray, and at least one electrostatic generating unit configured to apply a voltage across a spray path of the cleaning spray, so that the spray is electrostatically charged. At least a portion of the at least one extension is coated or shielded by nanotube particles.