Depending on baby's mood, the DuetSoothe can sway side-to-side or swing front-to-back, making it a double-duty nicety. mobile above 5-point harness 2-speed vibration 6 swing speeds plays 10 classic melodies and 5 nature sounds swing is for babies 5.5-30 lbs.; rocker: 5.5-25 lbs. requires 4 D batteries, not included plug in to save on battery usage 34x33x43 polyester/cotton seat pad imported