You can use the switch on the Dyson High Torque and Digital Motorbar cleaner heads to further adjust the suction. Slide it towards the '+' for maximum suction for ground-in dirt. And towards the '-' for light dirt on deep pile carpets and delicate floor coverings, such as vinyl and linoleum, plus large debris on durable floor coverings. Leave it in the middle for dust and debris on carpets, rugs and hard floors.