This Musical Mobile Runs On Batteries, So The Music Sleep Time Will Last Until It Is Turned Off! What Is Developing With This Wonderful Musical Mobile? -Sensory Skills: Calm Music Is Heard While The Mobile Slowly Rotates, Minimizing Stimulation And Relaxing Your Baby. -Safety And Happiness: Familiar Melodies And Faces Welcome Your Baby Again And Again As They Become Part Of The Bedtime Routine. -Gross Motor Skills: The Mobile Will Stimulate Your Baby To Reach Out And Touch The Sweet Little Friends, Helping To