It will be able to control by Alexa in the future.
Candela is Bluetooth based, currently it can't support Alexa by itself alone. But we are planning to develop a Bluetooth-WiFi bridge, which can help Yeelight Bluetooth devices access network. This upcoming bridge will make Candela compatible with current cloud infrastructure which was designed for Wi-Fi devices. Work with this Bridge, Candela will be able to support Alexa, IFTTT, Google Home etc.