Built-in Speaker and Voice Activated This projector has a built-in speaker; you can connect Bluetooth via a mobile phone or insert a TF card to play music. The voice-activated flicker mode allows the projection to change colors in time with the music or when you clap your hands. It helps make your party more fun or helps your children sleep soundly. Firmware and Timer This LED projector can control all projector functions with a remote control, including setting a timer. This LED night projector comes with an automatic shut-off timer. You can set the automatic shut-off time to 1 hour, 2 hours as needed, providing convenience and saving electricity. Adjustable Brightness and Night Light With 3 levels of brightness adjustment, you can set the projector to meet your various needs. Let the breathing and flowing nebula fill your imagination and soothe your mood with melody. This projector perfectly builds up the night atmosphere. Best Gift This projector is suitable for bedrooms, parties, weddings, stages, game rooms, etc. Also an excellent gift for birthdays, Valentine's Day, Halloween, or Christmas. It can also be used as a brightness-adjustable night light, ocean wave lamp, party lamp, disco ball, and game room decor.