Without it, your smart lights are just normal light bulbs. It also syncs seamlessly with pre-existing Nest and SmartThings systems. Can sync up to 50 Hue lights and up to 12 accessories (not included).
LEFXMOPHY Hue Power Cord Supply Replacement for Philips Hue Bridge 458471 2.0 2.1 1st 2nd Gen CE0979 464479 3241312018A Hub 5V Charger UL Adapter : Baby
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Philips Hue Hub - ZigBee IP Bridge - CE0979 - First Generation With AC Adapter
Hue Bridge - Smart Control for your Lights
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PHILIPS HUE ZIGBEE IP Bridge £19.99 - PicClick UK
PHILIPS HUE IP Bridge Hub ZigBee IP CE0979 1st Generation And Power Supply $12.99 - PicClick
Replacement for Philips Hue Bridge Power Adapter 458471 2.0 2.1 1st 2nd Gen CE0979 464479 3241312018A Hub Power Cord (5V UL Listed) : Electronics
Hue Bridge - Smart Control for your Lights