The C by GE Smart Switch-Dimmer adds smart bulb functionality to traditional bulbs and keeps smart bulbs smart. The smart Wi-Fi switch works as dimmer switch while enhancing the traditional bulb functionality to include out-of-home control, scheduling and scene setting. When C by GE Smart Bulbs are installed, the smart switch allows app or voice control even when power is turned off at the switch. Pair the Smart Switch with C by GE Smart Bulbs in other fixtures like table lamps and control your all your lights in the room from one wall switch. C by GE Smart Switch wirelessly connects with other C by GE Smart Switches so you can control the same light fixture from multiple switches without a travel wire, even if the switches are on different circuits. Simple DIY set up. The Smart Switch connects directly with Google Home and Amazon Alexa devices without a hub required. Neutral wire--usually a white or gray wire--is required.