【4inch RGBCW Lighting & Music Sync】 Buy a Ustellar smart wafer light and you will get a mood light and a daily light at the same time. Tunable white warm and cool from 2700K to 6500K for your daily use. 16 million colors and 8 different lighting scenes for an atmosphere decoration. In addition, the colored smart recessed lighting will change with the music beats, which is perfect for parties, movies and appointments 【APP Control 】You can easily control multiple smart downlights with your smartphone. You can choose different colors, customize the mode, set timer, control the lights in groups. Download APP “Smart Life”- connect the hub to APP - pair smart downlight to hub,then you can start to use your canless recessed lighting. (compatible with 2.4GHz Wi-Fi only) 【Voice Control & BT Remote Control】The canless ceiling light is compatible with Alexa and Google Assistant. You can control your recessed rgb lighting absolutely hands-free with simple voice commands.One BT Remote Control provided additionally makes the light more convenient for daily use. You can configure only the remote control to control the lights in a certain space, such as a bedroom. PS: The remote control can only be used after pairing in the APP