Made in Germany, the AUTOMATIC X series are the best commercial-grade, upright vacuum cleaners in the world because they are technically advanced and uniquely easy to use! They have truly automatic height adjustment, to ensure optimum performance on carpets and hard-floor surfaces along with superb pet hair removal. Both models feature an electronic controller that acts as a brain, measuring the resistance of the spinning brush roller against the floor and adjusting the power head up or down to the appropriate cleaning height. The sealing strip located behind the brush roller further improves hard floor cleaning performance, by channeling the airflow and preventing debris kickback. Users are alerted to a worn brush, and the vacuum shuts off automatically when a full bag, a clog, or a brush roller obstruction occurs, which protects the motor, belts and carpets from damage. The AUTOMATIC X4 is powerful, yet quiet, and will provide years of reliable use! It also has a convenient instant-use cleaning wand and suction hose with an eight-foot reach, three on-board tools, a lifetime belt warranty, plus a five-year warranty on other parts and labor. Additional features include excellent filtration, a giant 1.4-gallon bag, an extra long 40-foot cord, rubber-coated wheels to protect floor surfaces, a low 5.5-inch horizontal cleaning profile that fits under beds and furniture, and tool-free brush roller removal for replacement or bristle cleaning.