The Friends of Hue switches have been on the market for almost two years now. Philips Hue and EnOcean supply the technology, and various manufacturers supply the matching plastic parts to ensure that the Friends of Hue switches match the respective switch ranges. Among others, Gira, Busch-Jaeger and Jung are among the manufacturers involved.
Much quieter Friends of Hue switch with button cell: comparison with the EnOcean module Probably not really official yet
Probably not really official yet