On/Off Button: Play/pause function. Press to start, press again to stop; the motor synchronizes with the music: the motor rotates when music plays, stops when paused. Mode Button: Cycle through 12 songs. Each press plays the next song; music automatically plays the next song if no button is pressed. Volume Button: Two buttons with the same function, cycling through high/medium/low volume levels. Each press changes the volume. Customizable Volume: Unlike music boxes with fixed volume levels, this crib mobile motor offers stepless volume adjustment from 0 to 100. Say goodbye to fixed volume limitations! Soothing Music: 12 lullabies to choose from. Find your baby's favorite and help them drift off to sleep quickly. User-Friendly Design: Auto-shutoff after 30 minutes. Compatibility: Fits most crib mobiles 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 Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3cm.