Great question, MoMo! While you can still control the Smart Bulb manually from a switch, the switch must be in the 'On' position in order to control the Smart Bulb from the App. There is also a SmartThings Button available that can be used like a switch to control the Smart Bulb and/or other compatible smart devices. Please note that the SmartThings Smart Bulb does require the SmartThings Hub. Thank you! ~Samsung Brand Ambassador