„Usus“ is a sustainable speaker system consisting of a home speaker, an amplifier and a Bluetooth box. The centrepiece is the removable loudspeaker which can be placed in new contexts of use again and again. The technology of the loudspeaker, which has remained the same for more than twenty years, is thus preserved in the long term. The module is housed in a user-friendly system that can be easily repaired, refurbished, resold or recycled.