On/Off Button: Play/pause function. Press the button to play, and press again to stop. The motor rotates in sync with the music; it stops when the music pauses. Mode Button: Song selection function. Choose from 12 melodies with each press. If no button is pressed, the music plays automatically. Volume Button: These two buttons control the volume, offering high/medium/low settings. Each press cycles through the three levels. [Adjustable Volume] Unlike baby music boxes with only 3 volume levels, this crib mobile motor features stepless volume control. Adjust to the perfect level from 0 to 100. Say goodbye to limited mobile music box volumes! [Soothing Music] Features 12 lullabies that can be switched at will. Find your baby's favorite tune and help them drift off to sleep quickly. [Child-Friendly Design] Automatic shut-off after 30 minutes. [Compatibility] Fits most crib mobile hangers and arms. Requires 2 AA batteries (not included). Color: White Material: ABS Size: 14 x 9 x 3.5CM Package Contents: 1 x Music Box