Powered by NXT flat-panel technology, the entire front surface is a stereo speaker that produces rich tones and lush bass. It´s versatile; use it with your MP3 player, CD player, DVD player, or anything else with a standard headphone jack output. Then store the 3.5 mm input jack in the back of the speaker when you´re on the go. Flexible power options include an international power adapter as well as 4 AA batteries (not included) capable of 45 hours of battery life. Goes anywhere. Use with anything.