Universal power adapter supplies 4.5V DC at 1A to many of the new products in our jacks in the box line as well as most CD and MP3 players using the common 4mm barrel plug with center positive. The UPA comes with 4 different AC plug adapters and will accept any input voltage from 100 to 240V AC, 50 to 60Hz, which means it will work in nearly every country on the planet.