1. This vacuum cleaner uses a smart chip with a child lock function, the switch not open when tapped to preventchildren from accidentally touching it. 2. Normal mode method: long the switch for 3 seconds and then , at this time release the switch is normal mode, less noise, suitable for cleaning small area of dust. 3. Super mode method: long the switch for 3 seconds, then release the switch and the switch again to enter the super mode. Clearly can feel the increase in suction, suitable for deep cleaning crevices of dust.