[PLEASE CHECK BEFORE PURCHASE] This module is ONLY compatible with Reset (Momentary) switches. It is NOT compatible with standard UK Rocker/Latching switches. Using the wrong switch type will result in failure to dim. [BACKBOX DEPTH REQUIREMENT] Due to the wiring space needed, a minimum backbox depth of 35mm is required. It will NOT fit in standard shallow 25mm UK wall boxes. Please measure your backbox before ordering. [NEUTRAL WIRE & HUB REQUIRED] A Neutral Wire is mandatory for this module to function. As a ZigBee 3.0 version, it requires a Tuya ZigBee Hub (Sold Separately) for App and Voice control. [DIMMABLE BULBS ONLY] Only compatible with Dimmable LED and Incandescent bulbs. Maximum load: 150W. Using non-dimmable bulbs will cause flickering and may damage the module. [2-WAY CONTROL & TIMERS] Converts your existing 2-way circuit into a smart one (when used with reset switches). Enjoy hands-free voice control via Alexa/Google Home, and set schedules or countdowns via the Smart Life/Tuya App.