SoundLink Color. The Bose SoundLink Wireless Mobile speaker uses many proprietary acoustic, mechanical and electrical technologies. The most prominent of these are the dual opposing passive radiators, which enable the SoundLink speaker to deliver high-quality low-note performance in a small enclosure. The unique, proprietary 'waffle' shape of the radiator surrounds also produces performance far beyond competitive products. With the radiators placed symmetrically opposite each other, the SoundLink speaker reduces unwanted and wasteful vibration, turning that energy instead into acoustic output. The SoundLink speaker's sleek design features a Black aluminum grille and brushed chrome end caps. It has an integrated cover made of durable Slate Gray nylon, which protects it during transport. It's easy to put the speaker in your bag and take it with you to the park, the beach or anywhere you go. Plus, the cover unfolds into a stand. The automatic sleep-mode feature powers down the speaker when you close the cover.