SwitchBot Curtain U rail 3 is now upgraded to help make your curtains slide more smoothly and still makes your curtains smart in seconds without the need for screws, nuts, or bolts. Multiple controls.Use app or remore or Use with SwitchBot Hub Mini/Hub 2(both sold separately), and SwitchBot Curtain can be compatible with Amazon Alexa, Google Assistant, Siri, IFTTT and others for even more home automation. Just say Alexa/Ok Google/Hey Siri, let sunlight in to open your curtains. Moreover, the smart curtain also supports Apple Homekit when add SwitchBot Hub 2.