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It adjusts the vacuuming power, strength, or intensity.
Sorry, there was a problem. Please try again later.Hi there, this is Kelly with Dyson. That red slider controls the suction and allows the vents on the front of the head to open further, if you're vacuuming different flooring surfaces, picking up larger debris, etc. In the user guide for your V15 Detect it will go over the different settings, and suggest best uses for moving the slider to the left, right and center. To utilize Maximum suction for ground in dust and debris, you can move the slider over to the (+) This is suitable for vacuuming durable floor coverings, hard floors and heavily soiled carpets and rugs. The best suction for dust and debris is the middle setting. This is best for lightly soiled carpets, rugs and hard flooring. It's also the ideal setting for large debris, such as peanuts or rice. This setting might work best for your wooden pellets. The suction slider in (-) is great for deep pile carpets and delicate flooring. Any type of floor where you might experience greater resistance, this setting is ideal for. It's also great for more delicate floor surfaces like vinyl, parquet and linoleum. We hope this helps! Best wishes, Kelly Dyson Customer Support
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