Product Description Color Changing Tunable White Adjustable Brightness Voice Control ;Timer Schedule 【YZhouD  Smart Application & Remote Control】You can control the smart light bulb anytime and anywhere through your mobile phone. Whether you are working in the office or on vacation, you can adjust the smart home lighting status at home at any time. In addition, you can use the grouping function to create a group for multiple bulbs, and then activate them all with one click (only for stable 2.4GHz Wi-Fi). 【YZhouD  Smart Application & Remote Control】You can control the smart light bulb anytime and anywhere through your mobile phone. Whether you are working in the office or on vacation, you can adjust the smart home lighting status at home at any time. In addition, you can use the grouping function to create a group for multiple bulbs, and then activate them all with one click (only for stable 2.4GHz Wi-Fi). 【Voice Control】YZhouD  smart light bulbs that work with Alexa. You can use simple voice commands to easily turn on/off the lights, change the light color, and dim the brightness. Our Alexa light bulb is easy to install and no hub and subscription are required. 【Voice Control】YZhouD  smart light bulbs that work with Alexa. You can use simple voice commands to easily turn on/off the lights, change the light color, and dim the brightness. Our Alexa light bulb is easy to install and no hub and subscription are required. 【Timer and Schedule】The color changing light bulb can be turned on/off automatically through the mobile APP, and you can also set a countdown timer. Set the Wi-Fi light bulbs to turn on or off at a specific time, so you can turn on the led bulb when you go home, turn off the lights when you go out.