The Dyson is one of the most effective cordless vacuums in the world. Stiff nylon bristles remove ground-in dirt from carpets. Carbon fibre filaments remove fine dust from hard floors. Many other handheld vacuum cleaners remain switched on from the moment cleaning starts. Battery power is wasted between cleaning tasks. Dyson cordless vacuum cleaners have a run-time enhancing trigger. Trigger grip releases instantly, meaning battery power is only used for vacuuming. On when you need it, off when you don't.