The X4 Boost model offers a choice between two modes of automatic brush agitation! The default setting is perfect for most flooring types, but by activating the Boost Button, greater resistance against the spinning brush roller is allowed before height adjustments are made, which causes more aggressive brush action.
 
The AUTOMATIC X is the world’s most technically advanced and uniquely easy-to-use vacuum cleaner! The 12-inch X4 features a truly automatic height adjustment, using an electronic controller that measures the resistance of the spinning brush roller against the floor to signal up or down adjustments, which ensures optimal performance on both carpets and hard floors. The user is also alerted to clogs, a worn brush, or a full bag, and the vacuum automatically shuts off when brush obstructions occur to protect the motor and belts from damage. The X also has an instant-use cleaning wand and suction hose, a lifetime belt warranty, tool-free brush roller removal, a 40-foot power cord, and three on-board attachments.