It uses your car's 12V DC battery to power household AC and USB powered devices.
Brad's Deals Editor Candace,
This NOS 130 Watt Slimline Power Inverter with USB drops from $30 to $19.99 at Sportsman's Guide. Plus activate this free 3-Month Buyer's Club Trial Membership and enter the coupon code BRADSHIP at checkout to drop the price further to $17.99 and get free shipping. The best price we could find anywhere else was $29. With this inverter, you can use your car's 12V DC battery to power household AC and USB powered devices. It charges electronics twice as fast compared to other USB ports, and it can provide up to 130 watts of power. There's no sales tax (except MN and CA).