PSP Logic 3 Sound System 2.1 Sub-woofer Speaker System - 12 Watts RMS - 120 Watts PMPO. Enhanced sound system for the PSP utilizes a subwoofer, dynamic tweeter speakers and a 3D surround-sound processor Operates from AC Adaptor (included) or Batteries 4xAA (not included) Blue soft-light illumination and LED power indicator Recharging station for PSP Extra long 3.5mm Stereo line-in for playing PSP whilst connected to speaker system or for connecting other audio devices like iPods, MP3, MD, CD player. etc