Question about Bosch Professional GTR 550

The GTR 55-225 is a newer model than the GTR 550 and offers several improvements over the older model. The GTR 55-225 features a patented ultra-flexible sanding head that allows effortless movement over walls and ceilings and reduces the risk of surface damage. The GTR 55-225 is also equipped with an integrated ceiling suction function, which minimises fatigue during longer applications as the perceived tool weight is significantly reduced by the suction force of the resulting vacuum.