Bang & Olufsen is aiming to take the music you listen to on a smartphone and put it on the wall. The BeoSound Essence is a hockey puck-shaped music controller that reduces the number of actions you need to perform to one: just tap, and the music will start playing. What music, you ask? That depends on what you were playing last. The dial on the wall is just the first part of the product. The second part is a hideaway box that is wired to your speakers and communicates wirelessly with music sources. Those sources can be smartphones, tablets or PCs — anything with Wi-Fi connection. The Essence is compatible with Apple AirPlay, Spotify Connect and standard DLNA connections.