The Aqara Dimmer Switch H2 EU (KD-R01D) in gray smartens dimmable lighting in modern and classic homes. It supports dual-protocol Thread and Zigbee, enabling Matter compatibility and direct integration with Amazon Alexa, Apple Home, and Google Home via a Thread Border Router. Works with both neutral and no-neutral wiring, and supports leading-edge and trailing-edge dimming for incandescent, halogen, dimmable CFL/LED, and ELV bulbs. With neutral wire, it offers real-time power monitoring and overload protection. The 55 mm modular design fits standard frames.