You set them up one at a time. But through your app or echo/google or apple home device you can control them either separately or together. So you can have one on or both and they can be set with different colors. You name your bulbs and that’s how you tell your echo device to turn them on or off or change colors, you can put your bulbs in a group, like name it a room (kitchen) and then you can control all the bulbs in the kitchen together. The same things can be done through the app. Hope that makes sense.