This item works as advertised, but it is a modified sine wave inverter.If you are planning on using it to charge cordless tool batteries---don't.The owners manual contains a caution about using with cordless tool chargers (such as Dewalt).Do a quick Internet search on "cordless tools" and "modified sine wave inverter" to confirm whether your tool is effected.Some other items that may not work well are appliances with clocks, microwaves, etc.Be sure you understand the limitations of a modified sine wave inverter.
For those smaller appliances that will run on modified sine wave, this item works well.
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Xantrex Technologies 851-0400 XPower Plus 400-Watt InverterProduct Description: Power your electronic devices when you're on the road with the Xantrex XPower Plus 400-Watt Inverter. The smallest 400-watt power inverter on the market, this handy device plugs directly into your car, truck, van, RV, or boat's lighter socket to convert power from your vehicle's battery into standard utility power. And with dual three-prong outlets, this in-vehicle power inverter lets you simultaneously run or recharge multiple devices, such as cell phones, camcorders, handheld gaming devices, stereos, laptops, TVs, and DVD players.
The Xantrex XPower Plus 400-Watt Inverter
At a Glance:
Quiet alternative to generators
In-car power inversion for use during transit
320 watts of continuous power with 600-watt surge capacity for safe, consistent power
Dual 3-prong grounded 120-volt AC outlets for running multiple electronics
Automatic shutdown protects against overheating and overloads
This in-vehicle inverter lets you turn your ride into a mobile office or entertainment center.
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Quieter and more compact than a generator, this powerful tool can run multiple devices at once.
View larger.Power Your Electronics in Any AutomobilePlug the XPower Plus 400 into your vehicle's 12-volt lighter socket and turn your ride into a mobile office or entertainment center. This power inverter incorporates high-frequency technology to convert power from your vehicle's battery (12-volt DC) into standard utility power (115-volt AC, 60 Hz), so you can power your laptop to get some work done on the road--without draining your expensive computer battery--or plug in a TV or DVD player to keep the kids entertained on a long trip. This versatile gadget gives you options for keeping informed, up to date, or entertained anywhere, and it's a perfect companion for camping, beach trips, and tailgates.
Built-In Features for Convenience and SafetyThe XPower Plus 400's dual three-prong grounded AC outlets give you the ability to simultaneously power multiple devices, such as cell phones, camcorders, stereos, laptops, and TVs. And with 320 watts of continuous power and a 600-watt surge capacity, this power inverter even has DC terminals so it can be directly connected to your car, RV, or boat battery to support higher AC loads.
For protection, an integrated automatic shutdown prevents overloads, overheating, and low/high battery conditions. The inverter also senses low battery voltage so you never have to worry about completely draining your batteries. An added bonus, the XPower Plus 400's operates quietly, so you can enjoy on-demand AC power in your car without giving up your peace and quiet or drowning out your favorite tunes.Lightweight and portable, this power inverter measures 5.88 x 4.12 x 2.25 inches (LxWxH) and weighs one pound, six ounces. The Xantrex XPower Plus 400 is covered by a one-year warranty.
About XantrexXantrex Technology Inc. (xantrex.com), a subsidiary of Schneider Electric, is a world leader in the development, manufacturing and marketing of advanced power electronic products and systems for the renewable and mobile power markets. The company's products convert and control raw electrical power from any central, distributed, renewable, or backup power source into high-quality power required by electronic equipment and the electricity grid. Xantrex is headquartered in Vancouver, Canada, with facilities in the United States, Germany and Spain, and a joint venture in China.
What's in the BoxIn-car power inverter.
Plug it into your car, truck, van, RV, or boat's lighter socket to power everything from DVD players to handheld gaming devices. 
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I have owned a few inverters and this one is the best. My last one was a 1500 watt Xantrex which didn't have the digital reader that monitors the battery and the output. Uses minimal power when turned on and not being used. Cooling fan only comes on when needed. I am very pleased with this purchase.
