The concept of this product is great, but this unit (and the one that replaced it) shorted out and fried. Two different units in two different locations (buildings) so it wasn't the outlet.
I think it has to do with the rotating AC blades.
The mechanism to flip out the prongs that plug into an AC electrical outlet didn't work smoothly. I had to pry the "sticky" prongs out with another object. That was inconvenient, but once out the product worked fine.
Ordered 3 of these since the price was so good...had read a few negative reviews/comments, but most of them were very good. Only had them about 2 weeks, but so far my wife, daughter, & I have used them numerous times & had no problems whatsoever. Haven't used them in our vehicles yet, but my guess is they'll work as well there as they did inside (wall outlets). Also like that they each have 2 USB ports, the cool blue light, & a neat grippy-rubber exterior, plus the foldable prongs & car plug.
I like the combination of cigarette lighter and 120 volt wall power sources for this dual USB charger. After ordering I noticed the wall plug was modular. Therefore, I also plan to find the international adapters for the wall plug.
The DoubleUP is a versatile DUAL USB charger that lets you charge your mobile devices at home or in the car! Its equipped with two universal USB charging ports and works with nearly any OEM USB charging cable. The innovative design includes two flip-down plugs in a single slim form-factor for AC and DC charging. Its lightweight, compact and innovative design makes it ideal for traveling. Great for charging Smartphones, E-Readers, MP3 players, iPod, iPhone, iPad, Bluetooth devices and more. The DoubleUP is constructed from premium quality materials and can fit in the palm of your hand. The foldout AC and DC plugs make this unit sleek and convenient to bring anywhere. Technical Specifications: Input: AC 120 240v | 50/60Hz ;DC 12 - 24v ; USB Output: DC5V5%, 1.5A ; Dimensions: 3 x 2.25 x 1.125 inches ; Weight: 3 oz(85 gm). Using your OEM USB Cable, the DoubleUP works With all USB powered Smartphones, MP3 Players, E-readers, iPod , iPhone , iPad , Kindle Fire and More. (Only capable of charging 1 iPad or Kindle Fire Tablet at a time. Does Not work for other Tablets).