For use when purchasing frozen goods away from home, there are a few grocery clearance outlets 25 to 50 minutes drive from home so this thing which fits in the front passenger side footwell of the car will stop any purchases from deteriorating in transit back home. Normally I run the unit from the car's cigar lighter adapter - the drill battery and inverter can put out the same current as the accessory power outlet, just not for the same time, though.