Rock On - a new and unique product that turns any infant car seat into a hands free rocker! The Rock On is a small portable platform that is easy to use. Take it with you anywhere you go. Just place the infant car seat carrier (with the baby inside) on top of the platform, attach the safety straps, and press the "On" switch. Rock On gently provides a hands-free rocking motion which will help to keep baby content & soothed. Rock On is intended for use with babies weighing from 5lbs to 22 lbs. and measuring 19" to 26" long. Runs on 4 D-Cell alkaline batteries (not included) tested to run approximately 300 hours on 1 set of batteries. AC adaptor is available and can be purchased separately. Rock On easily fits in most diaper bags and only weighs 5 pounds. Sleek and Slim Design 11.5"L x 12" W x 3"H.