RocknStroll, the Hands-Free Stroller Rocker. Smoothly rocks any Stroller or Pram . Comes with rechargeable portable battery with 60+ hours of power. RocknStroll Mobile has a portable design that can easily attach to most strollers or prams, gently rocking your baby. Portable battery + cable (to connect to the motor) is included. Suitable from birth. Electrical safety tested to EU/USA and international standards.