GMC 1996 Sierra Owner's Manual page 115

Accessory Power Outlets
Two auxiliary power outlets are located near the
cigarette lighter. Use these outlets to power mobile
telephones or other devices designed to operate with
vehicle electrical systems.
Sun Visors
To block out glare, you can swing down the visors. You
can also swing them out to help block glare at the front
and side windows.
Your visor may have a strap to hold small items, such
as maps.
Some visors have an
extender on the inside
edge. When the visor is
down, pull the extender
out for extra glare coverage
at the front or side.
Some visors have mirrors with lamps. If the mirror has
lamps, they will come on when you lift the mirror cover.
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