This Graco DuetSoothe Swing + Rocker combines the functionality of a swing with the portability of a rocker. This Swing/Rocker features 6 speeds; provides infant head support; plays music, nature sounds and has 2 vibration levels. The removable seat can be used a carrier or a rocker. Plug in this Swing/Rocker to save money, or use it with batteries for convenience; it requires 4 D batteries, sold separately. Some assembly is required.