Shelly's Duo GU10 WW/CW smart lightbulb is designed to be installed and configured in minutes, with the ability to be screwed into a standard downlight fitting and offering instantaneous customisable dimming and warm / cool lighting shades. The lightbulb can either be controlled and fine-tuned manually from the free Shelly mobile app, or incorporated into a wider smart scene of schedule involving multiple Shelly-connected devices like heating, motorised blinds and windows. In addition to its smart lighting functionality, the Duo GU10 WW/CW also has built-in power monitoring, and can accurately record its own power usage to within 1% accuracy. The bulb itself supports both 110V and 220V power supplies, and is compatible Android, iOS, Amazon Alexa, Google Assistant, and home automation servers using MQTT, CoAP, and REST API.