Note:The wifi version connects directly to the APP via wifi, no gateway device required. Zigbee version must work with Tuya zigbee hub or smartthings hub.how to connect to App: Q1:How can I know the size of the bulb and the size of my lamp? A:Look at the , there is no difference in the size of ordinary bulbs Q2:110V or 220V? A:bothin the range of 100-240 can be used Q3:has warm and cold light at once? Ayes,You can adjust to warm light or cold light through APP Q4:Color change? A:YES! Any color Q5:Does this work with tuya smart or Smart life app or others? A:wifi version works with tuya smart/smart life app. zigbee version works with tuya smart/smart life app and smartthings Q6:Does this product support Alexa/Google/Alice/Smartthings voice control? A:YES!You can control the light on/off, brightness, and color through these voice assistants Q7:Work with alexa in any langua