This
Koolatronn AC adapter allows you to run your 12 Volts DC devices from a
standard 110 Volt wall socket at your home. Use it to run cell phone
chargers, portable coolers, and more. This step-down transformer was
designed for use with Koolatron coolers, but it will power any 12V unit
that is meant to plug into a car cigarette lighter socket (only products
with less than a 5 amp draw).