Power button: play/pause function button, press the button once to , and then press the button once to stop playing; the motor works synchronously with the music: the motor rotates when the music is playing, the motor stops rotating when the music is paused. * Mode button: song switch button, a total of 12 songs, each press of the button to play the song; do not press the button, the music will automatically play to the song. * Volume button: these two buttons have the same function, a total of 3 volume levels high/medium/low, each press of the button switches the volume between the 3 levels high/medium/low. [Arbitrary volume] The traditional baby music box only has 3 volume levels. The crib mobile motor uses stepless volume, you can choose the most suitable volume from 0 to 100. Say goodbye to the traditional mobile music box. [Soft music] 12 lullabies that can be switched at will. Previous, next. Choose your baby's favorite music and fall asleep quickly. [User-friendly design] Automatic shutdown after 30 minutes [Compatibility] Fits most crib mobiles, crib arms. 2 AA batteries required, not included. Color: White Material: ABS Size: 14 x 9 x 3.5 cm Package Contents: 1 x Music Box Only the above package contents, other products are not included. Note: Light reflections and different monitors may cause the color of the item in the picture to look slightly different from the actual item. The measurement allowed error is +/- 1-3 cm.