The speakers, I mean. They're really waterproof. Anyway, there's also a light factor. Orbs love light. Light loves Orbs.
Light reflects off of the polished metal.
You can see hundreds of little images of yourself in the Orbs. Oh yeah, the light. The light activates the Orbs. With the light on, they sing. A pleasing, soothing harmonic drone builds and carries through a crowded room.