A21 Wi-Fi, tunable white, smart LED light bulb. Easy plug and play set up. Works with your existing Wi-Fi. Control with the Wiz app or voice assistant. Compatible with Google Assistant, Amazon Alexa, or Siri Shortcuts. Choose from a wide range of energizing cool white to soft warm white, or select from the preset modes such as Focus and Relax to create the best ambience for your activities. Automate your lights with schedules to fit your daily or weekly routines.