Portable system, e.g. multimedia equipment, has an electrically operated device and a source of energy to create an electric current during a person's movement/walking

摘要

A source (3) of energy is so designed that it generates electric current/power as a person moves/walks whilst carrying a multimedia system (1) with them. The source of energy can operate in the form of piezoelectric crystals, electrically conductive gels or a moving/oscillating mass. The electrically operated device (2) operates as a mobile telephone, a radio, an MP3 player, etc.