CSL - Bluetooth Sound System | Aluminium enclosures / Optic: brushed aluminum | Super Bass System | Portable Speaker / Wireless | Smartphone / Tablet / PC + Mac (Electronics)
I find the small "Brüllwürfel" super. Can really really loud and sounds very good nonetheless. Battery life of about 4 hours is sufficient for me. The range between tablet / mobile speakers and is only a few meters, I personally find but not as bad.