As far as functionality is concern, Wagan 400-Watt works. However, the design of the product is mediocre. This product is full of stickers or sticky labels for every switches (absolutely nothing is printed). Even the product logo on the top, right below the handle, is not well made. It’s sticking out around its edges. It only a matter of time before all the stickers come off the unit. Also there is no manual on how to use this unit. I finally had the chance to use this product to jump start my car. It took me a while to figure out why it didn’t work initially. I finally figured out that after clamping the red and black cables onto the car battery, I had to turn on the switch that is located in the back of the unit. The switch label does not tell you what it’s for, only that the sticky label says, “On and Off”. Other than those sticky labels I’ve mentioned here, the product works just as advertised.I like having the security of being able to pump up a tire or jump start my car anywhere, anytime. But my primary reason for purchasing the Power Dome was to provide some power while camping. Using it to charge phone, ipod, etc. So far, it’s working out great.
Read related article at Better than expected functions as advertised as a jumper.