Theoretically, there is not limit or number of concurrent devices connection in Bluetooth® specification. Also, we are also making PLAYBULB X App as “One App. Controlling Many Products” so to enhance users experience of PLAYBULB products. We recommend at most FIVE PLAYBULB rainbows (or other PLAYBULB products such as PLAYBULB candle and PLAYBULB color) in a group for an optimised group control performance.