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Description ① Hub REQUIRED (Sold Separately), like Sengled Smart Hub, SmartThings Hub, Wink Hub and Hubitat Hub. Not compatible with Philips Hue bridge system. ② Not Wi-Fi CONNECTION, JUST support ZIGBEE technology (Connect to the internet via Ethernet cable, not limited by 2.4 or 5 GHz routers). ③ Compatible with Amazon Echo built-in hub like Echo 4th Gen/Echo Plus/Echo Show 10/Echo Studio. Additional hub required when connect smart bulbs to Echo dot or Google Assistant devices. ④ Install Sengled smart light bulb into a E26 socket, then continuously switch on/off the power supply 10 times to reset, within 1 minute, it will be connected. ⑤ You also can scan the QR code on the bulb after the bulb has been reset, then add smart light bulb follow the App instructions.