This is a 5 watt dimmable smart LED candle bulb by V-Tac that will emit a RGB colour and is completely CCT changeable (WW CW and Daylight) over a 30000 hour lifespan. The smart bulb is a direct replacement for a traditional 28w candle bulb and is supplied with an E14 small edison screw cap base. This smart candle bulb is compatible for use alongside the Amazon Alexa and Google home technology and can be controlled through the downloading of the V-Tac smart mobile and tablet application (Offers multiple functions such as dimming on/off and colour changing). Product Dimensions Diameter 37mm x Length 100mm.