EnOcean Easyfit Self-Powered Single / Double Rocker Wall Switch E8221-A270 & A280 - Casambi 

Self-powered wireless controls are simple to install. The Single / Double Rocker Wall Switch using the European 55 x 55 form factor use energy harvesting technology to communicate wirelessly with other devices supporting the Bluetooth Low Energy (BLE) Advertising standard. They provide convenient control of lighting, temperature and miscellaneous electric loads.

The wall switches are self-powered and never require batteries because the simple act of pressing the rocker generates enough energy to send wireless Bluetooth Low Energy (BLE) Advertising telegrams to other devices. The Single and Double Rocker Pads can optionally be configured by means of an NFC (ISO 14443) interface.