What are the three power modes and what are they used for?
The three power modes are Eco, Auto/Med, and Boost. Eco mode provides maximum run time for longer cleans, Auto/Med mode offers the optimum balance of power and run time with suction that automatically adapts to dust levels, and Boost mode is designed for intensive spot cleaning of ground-in dirt. (Page 3)
From the official Dyson V10 Cordless Stick Vacuum manual, page 3
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