The Shelly Duo E27 WW/CW smart lightbulb is built for quick and easy installation, fitting seamlessly into a standard E27 downlight socket and offering immediate access to customisable dimming and a range of warm to cool white tones. Control can be handled directly via the free Shelly mobile app, or the bulb can be integrated into a broader smart home setup, working in sync with other Shelly devices such as smart heating, motorised blinds, or automated windows. Beyond its advanced lighting features, the Duo E27 WW/CW includes built-in power monitoring, capable of tracking its energy consumption with up to 1% accuracy. It operates on both 110V and 220V power supplies, and is fully compatible with Android, iOS, Amazon Alexa, Google Assistant, as well as home automation platforms via MQTT, CoAP, and REST API.