An apparatus includes at least one base layer arranged as a substrate for printed electronics； an energy harvester printed on the at least one base layer and arranged to transform kinetic energy into electric energy； an energy storage printed on the at least one base layer, coupled to the energy harvester, and arranged to store the electric energy； a display element printed on the at least one base layer, coupled to the energy storage, and arranged to provide a display view to a user of the apparatus； and a control circuitry configured to determine the amount of the electric energy stored in the energy storage and to control the display element to update the display view according to the amount of the electric energy. A method and a computer program product for controlling manufacturing of the apparatus are also disclosed.
