Rolsen RBM-412 Portable Stereo MP3 Player will let you enjoy the music on the go! The unit is really small, but it provides great powerful sound due to 6W power of the dynamics. The unit is featured with SD slot, USB-port and AM/FM Radio. Also it has Line in, that is provides playing MP3/WMA files from USB drives. Also it can be used as laptop speaker. The built-in alarm-clock will be a nice addition to the unit. The Rolsen RBM-412 comes with lithium battery so you can charge the unit by USB port without any problem.