Bests & Worsts Reviews from Amazon

First, BEWARE of other units specifying high currents for their multiple ports only to find out that they can't deliver high power (current) on ALL of them at once. Also, bottom price adapters can output too high of a voltage and damage or ruin your stuff. There's a lot of junk being sold, so do your homework. Well, I did it for you. See below. We just returned from 2 weeks in Europe and used this charger every night. Each night, it charged 3 phones, a tablet and GPS, all at the same time. There, it worked on 240V. So, I used a cheap outlet adapter (Ceptics USA to Europe Asia Plug Adapter) to feed European 240V into my RAVPower supply. The unit automatically switches from 240V to 120V. With these inexpensive adapters, I can use my charger both at home and abroad. To keep an eye on things, I used a BESTOPE Dual-USB Output Charging Detector to monitor how well each of the USB outputs was performing (voltage and current under light and heavy loads). Obviously, you don't need to do this. My Charger worked perfectly. I found that it works equally well on the 120V here at home. I have no affliiation with this or any other USB power supply company. I am just an electrical engineer and am picky about delivering reliable, safe power for my expensive electronics. Dr. Dan