Battery problems with the Hue Smart Button: Button cell empty in a few days - Hueblog.com
Philips Hue - Dimmer Switch, Regulador inteligente inalambrico para sistema iluminación Hue, para iluminación de interior, sala de estar, dormitorio.- : Amazon.es: Industria, empresas y ciencia
Gallery: Dissecting the Philips Hue Tap wireless, battery-less controller | Ars Technica
How to change the battery in your Philips Hue Dimmer Switch | iMore