Some weeks ago I was able to inform you about an interesting project of the Chinese manufacturer Sunricher. They have created a Hue-compatible switch, which has exactly the same dimensions as the known modules from the Friends of Hue switches. The major difference: By using an integrated button cell, the kinetic system for energy generation could be omitted, making the switch much quieter.
Silent Friends of Hue switch: No new info from Sunricher Project put on hold?
Project put on hold?