Fifty cents cheaper than the previous post and from a more reliable seller.
1st - You need a hub: SmartThings, Echo PLUS, Wink 2 or other compatible ZigBee hub. If you don't know if your's is compatible, Google your "hub and ZigBee"
2nd - If you don't have a hub this site and try to find a deal on an ADT SmartThings hub, regular Smarthings hub or search Amazon for this starter kit ( SYLVANIA 71932 SW Zigbee Starter Kit ). It is the same bulb but it includes a hub, but your better off just buying a SmartThings hub as it is more universal.