Featuring the sounds of a tranquil forest at dusk and gentle water flowing, Nature Sounds Nap time Tonies makes sleep smoother. Immerse yourself in the calming sounds of the natural world with this new addition. Running time 120 minutes. Ages 3+Tonies work with a Toniebox (Purchased Separately), the innovative portable music player system that combines play, learning and listening. It's screen-free and easy for children to operate. Placing Tonies audio characters on the Toniebox begins playback automatically and taking them off stops it. Pressing the ears changes the volume. Tapping the sides of the box changes tracks and the fast-forward or rewind function is activated by tilting the Toniebox. Toniebox required for use. Wi-Fi connection required for initial setup.