ELBE ALT-3109. System type: 1.0, Recommended usage: mp3 player, Form factor: bag. RMS rated power: 3 W. Connectivity technology: Wired, Interface: 3.5 mm/2.5 mm. Power source type: Battery, Battery type: AA, Battery technology: Alkaline. Width: 110 mm, Depth: 45 mm, Height: 150 mm