Sengled Element Touch A19 Smart Light Bulb Dimmable, 60W Equivalent 2700k-3500k White, Energy Saving, Hub Required, 3 Year Warranty, Works with Alexa Works with Amazon Alexa to support dimming through voice control (hub required, Alexa device and hub sold separately) Wireless and app-based controls require a smart home hub. Works with Zigbee HA 1.2 compatible hub such as Samsung SmartThings and PEQ as well as iControl platforms such as Xfinity Home and Cox Homelife. Wirelessly control on/off and dimming via mobile app, home controller display,and web portal. Local on/off and dimmingcontrol via button on the bulb. Adjusts automaticallyfrom warm white to cool white asthe bulb gets brighter. Set custom lighting schedules and create lighting groups from a mobile device or smart hub.