Stereo Portable Rechargeable Speaker System for iPhone/iPod. Play and charges iPhone and docking iPod models. Operates on internal rechargeable battery or AC adaptor. Docking station charges and plays iPhone/iPod. SRS WOW sound enhancement. 4-speakers (2 active 2 passive) in Reson 8 chambers for great stereo sound. 6-watts. Line-in jack to play MP3/CD Players.