Power button: play/pause function button, press the button once to play music, then press the button once to stop playing; the motor works synchronously with the music: the motor rotates when music is playing, the motor stops rotating when the music is paused. * Mode button: function to switch songs, a of 12 music, each press of the button to play the song; do not press the button, the music will automatically play to the song. * Volume selection button: these two buttons have the same function, a of high/medium/low 3 levels of volume selection, each press of the button will cycle the volume between the 3 levels of high/medium/low to choose. [Arbitrary volume] The traditional baby music box only has 3 volume levels. The volume of the crib motor is stepless, you can choose the most suitable volume from 0 to 100. Say goodbye to the traditional mobile music box. [Soft music] 12 lullabies, which can be switched at will. Last one, one. Choose your baby's favorite music and fall asleep quickly. [User-friendly design] Automatic shutdown after 30 minutes [Compatibility] Fits most crib mobiles, crib arm 2 AA batteries required, not included. Color: White Material: ABS Dimensions: 14 x 9 x 35CM Package Contents: 1 x Music Box The above package content only, other products are not included. Note: Light reflection and different displays may cause the color of the product to look slightly different in the picture from the actual product. The measurement allowed error is +/- 1-3 cm.