The Bounge Amplifier relies on an unusual system to project sound. Kinetic energy produced by manually swinging its pendulum is harnessed to power the minimalist wall-mounted speaker pod. The creators of the device, Studio Toer explain more:

Bongue is a physic amplifier of mobile audio. The dynamic qualities give it a multisensory experience for daily life.

When Bongue is fixed it’s only amplifying the sounds from the music-device itself. When you start moving the arm it will give energy to the amplifier and by that it will increase the volume of the music-player.

Watch a video demonstration below to see it in action:

Studio Toer

[via Trend Hunter]