1997 GMC Suburban Owner's Manual - Page 133

Accessory Power Outlets Sun Visors To block out glare, you can swing down the visors. You can also swing them out tohelp block glare at the front and side windows. Your visor may have a strapto 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 glarecoverage at the front or side. Two auxiliary power outlets are located near the cigarette lighter. Use these outlets to power mobile designed to operate with telephones or other devices vehicle electricalsystems. Some visors have mirrors with lights. If the mirror has lights, they will come on when you lift the mirror cover. 2-59