Homedics HMDX-S50 Wireless Speaker System and Dock for iPod Rechargeable speakers play out to 5 hours on a full charge and can be placed up to 100' from the dock. Charge you iPod while it's docked Universal iPod dock fits all docking iPod models. Line in allows you to attach non-docking iPod models, CD players and other MP3 players. Enhanced acoustic resonance precision sound that is true to your music Individual speaker volume control