A self-assembly diy cardboard sound system Berlin Boombox kit with high fidelity speakers for your smartphone. The Berlin Boombox is different. A mobile speaker inspired by the old school ghetto blasters of the 1980s. Made from Cardboard and flat packed as a DIY kit. Our German engineered audio technology delivers powerful sound to your smartphone… no matter if iPhone, iPod, Android phone or windows phone. White. Dimensions: Width: 355 mm (13.8 inches), Height: 250mm (9.8 inches), Depth: 110 mm (4.3 inches), Weight: 850g Amplifier: Stereo amplifier, Class D SMD, 2×5 watts, 92% efficiency Speakers: 2 MIVOC PRO 75mm/3″ full range speakers, 4 Ohm, 60 – 20.000Hz Power: 3 AA batteries (included) Device: Max. Width: 74mm, Max. #thickness 16mm Connector: 3.5mm stereo plug (headphone plug) Material: Corrugated board type E, double layer, Thickness: 3mm.