x switch on/off button: button for play/pause function, press the button to , and then press the button to stop playing; motor works synchronously with music: motor rotates when playing music, motor stops rotating when music is paused. x Mode button: song switching function, a of 12 music, each button to play song; do not press the button music automatically play to song. x Volume button: these two buttons have the same function, a of high / medium / low 3 grades of volume , each press the button the volume will be cycled between the high / medium / low 3 grades to select.[Arbitrary volume]The baby music box has 3 levels volume only.crib mobile motor adopts stepless volume, you can the most appropriate volume from 0 to 100. Farewell to the mobile music box.[Soft music]12 lullabys, which can be switched at will. Last one, one. your baby's favorite music and go to sleep quickly.[ friendly ]Automatic shutdown after 30 minutes[Compatibility]Fit most crib mobile hanger,crib mobile arm.2 AA batteries are required, not included.Colour:WhiteMaterial:ABSSize:14 x 9 x 3.5CMPackage Contents:1 x musicboxOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.