Concerning this item Smart APP Control Compatible with Google Home, Amazon Alexa, and Smart Life Apps when in WiFi mode. (suitable for Android and iOS smartphones) Once the APP is connected, it is easy to use voice control to get it to function. For example, "Alexa, turn on the projector," "change the color to blue," and "set the brightness to 50%." The star is green. Noise-free With its cutting-edge noise reduction technology, this Nebula projector won't produce any noise while in use. Flexible Timing ON/OFF: You don't have to worry about it staying on all night because it will automatically turn on and off at the time you specify. The perfect gift and room décor, this night light projection can be used to decorate for birthdays, parties, Christmas festivals, special occasions, graduations, and more. The ideal choice for a gift for friends, family, lovers, kids, and teenagers.