The Link2Home Wi-Fi LED Dimmable Bulb with RGB allows you to move across the white light spectrum, from a warm 2,700K all the way to a cool 6,500K. You can also choose from over 16 million different colours using the scroll wheel on the Link2Home Pro app (Free). Use the app to dim the bulb too.Control your home atmosphere via app control or voice.Using the Link2Home Pro app, you can set up precise timers which can be customised by days of the week. Countdown timers can also be set. Multiple lights can be grouped together to control one room, one house, or control each light individually.The bulb can be fully integrated with Amazon Alexa and Google Assistant.  System Requirements: Wi-Fi Connection.Mobile or tablet with iOS 8 or later, or Android 4.1 or later.Link2Home Pro Account (Free).   Ref: UTTK14551