No, they only work with a standard wall flick switch
Yes, it does remember the last settings.
Yes, you will be able to turn the light ON/OFF via the the app or a voice command.
Please reset the bulb by turning ON/OFF 5 times. The bulb will flash slowly to confirm a factory reset. Please ensure the bulb is on the same network as the smart Zigbee hub.
They connect to the Hue, SmartThings & Alexa App(Echo Plus ONLY), available on Apple App Store & Google Play Store.