Made from recycled cardboard. Dimensions: 35x 25x 11cm (13.89.84.3) Audio: D-class stereo amplifier, 25watts Connector: 3.5mm stereo plug (headphone jack) Compatibility: Every Smartphone or MP3-player with headphone jack. *including: iPhone 5, iPhone 4S, iPod, Samsung Galaxy S4, Samsung Galaxy SIII, Nokia Lumia 925, Nokia Lumia 920, HTC One