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This cool inverter plugs into your tow vehicle’s trailer pigtail to convert 12-volt power into 110-volt power. Use it to run a blender long enough to make a frosty drink or to run a small TV long enough to watch Gone With the Wind. Use it and your 110-volt cell phone to rejuvenate your talk time on a trip. A USB plug accepts an MP3 player plug as well. Low-battery shutdown stops the inverter if the starting battery gets too low. $29.99; walmart.com
