EnOcean is best known for its battery-less devices: energy is harvested from a piezo-electric element (mechanical push-button), a solar cell (sensors with a small photovoltaic panel) or a Peltier element (thermal gradient), eliminating battery maintenance over a 10 to 20 year service life.

EnOcean supports three energy-harvesting sources. Piezo / kinetic converts the mechanical pressure of a push-button into a single telegram per press, typically yielding around 100 microjoules per actuation. Solar cells power temperature or occupancy sensors with very low average current draw. Peltier modules exploit a thermal gradient and are mainly used on radiator valves. A coin-cell battery option (e.g. PTM 200B) remains available for niche cases. Battery-less devices routinely operate maintenance-free for 20+ years, which is why EnOcean dominates retrofit projects in residential and commercial buildings.

When commissioning a piezo switch, remember that pressing AND releasing the rocker both generate telegrams; design your group object logic accordingly, otherwise you will see ghost double-clicks.