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?<br><br>A:Look at the description, there is no difference in the size of ordinary bulbs<br><br>Q2:110V or 220V?<br><br>A:bothin the range of 100-240 can be used<br><br>Q3:has warm and cold light at once?<br><br>Ayes,You can adjust to warm light or cold light through APP<br><br>Q4:Color change?<br><br>A:YES! Any color<br><br>Q5:Does this work with tuya smart or Smart life app or others?<br><br>A:wifi version works with tuya smart/smart life app.<br><br>zigbee version works with tuya smart/smart life app and smartthings<br><br>Q6:Does this product support Alexa/Google/Alice/Smartthings voice control?<br><br>A:YES!You can control the light on/off, brightness, and color through these voice assistants<br><br>Q7:Work with alexa in any langua