Cylinders are essentially tow portable TWS speakers that can be used individually or as a stereo pair.
Give one to your mate and let them listen to their death metal in the kitchen, whilst you use yours from something a little less stressful in the living room, then combine forces and play an album using both Cylinders paired to one device in wonderful stereo sound.
It is like that song by the spice girls in reverse, when 1 becomes 2!