The Broadlink Fastcon Hub GW4C is an accessory for the Fastcon products and can only be used with the Fastcon Starter Kit, GU10 Smart Bulbs, Sensor Kit. After adding the GW4C hub to the app, you can experience the full functionality of Fastcon smart bulb, connecting with Alexa or Google Home, voice control and remote control. Without the GW4C hub, you can only control the lights in your home through the FastCon APP. Please download the BroadLink FastCon APP. You can scan the QR code in the User Manual to download the app, or search for BroadLink FastCon in Google Play.