Power On/Off Button: Button for play/pause function, press the button once to play, press it again to stop playback; motor works in sync with music: motor rotates when you play music, motor stops when music pauses Mode Button: Song switching function, total 12 songs, press each button once to play the song; music plays automatically to the song when you don't press the button Volume Control Button: These two buttons have the same function, total high/medium/low 3 levels of volume selection, press the button to switch volume between high/medium/low 3 levels to choose [Gently Adjustable Volume] The traditional baby swing music player only has 3 volume levels. The motor of this swing music player offers stepless volume adjustment, allowing you to choose the most suitable volume from 0 to 100. Farewell to the traditional music player box [Soft Music] 12 lullabies that can be switched according to preference. The last one is number one. Choose your child's favorite music and fall asleep quickly [User-Friendly Design] Automatic shutdown after 30 minutes [Compatibility] Fits most baby swings, portable baby swings