Hi there, it's Jack at Dyson.
In Boost mode, DC59 offers 100 airwatts of suction to tackle really stubborn dirt or clinging pet hair. To activate Boost mode, just hold down the on/off trigger so the vacuum is running, then press and release the Boost button on the rear of the vacuum. To change back to regular power, you would follow the same procedure - holding down the trigger and pressing the Boost button a second time.
I hope this helps, but you're welcome to give the Dyson Customer Helpline a call if you'd like further guidance. You can reach our experts on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
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