Philips Hue 2-Pack Wall Switch Module (For Philips Hue lights only), White - Ezlo Smart Home Shop
Philips Hue White and Color Ambiance Medium Lumen (75W) Smart Button Starter Kit, Hub Included + Wall Switch Module Bundle, Compatible with Alexa, Google Assistant, Apple HomeKit - Amazon.com
Hue announce Switch Module - Homekit News and Reviews
First look: Philips Hue Wall Switch Module : r/Hue
I want to connect this wall switch module onto the app however I can't find the serial number. Help! : r/Hue
Philips Hue Wall Switch Module review: smart-ish, at last - The Verge
Setting up Philips' Hue Wall Switch Module with HomeKit and Shortcuts Automation | riedel.wtf