Shark WANDVAC WS632SM Series Owner's Manual page 7

Press the On/Off button on the handle to turn
on power. To turn off power, press the
button again.
POWER
CONTROLS
For an added boost in power, press and hold the
Button at the base of the handle of the handheld
vacuum. The Boost light will turn white in this mode.
Release the button to return to standard power.
BOOST MODE
s h a r kc l e a n . s g 7