Sphero 2.0 makes a triumphant return and this time the worlds first robotic ball is twice as fast, three times brighter and even more durable than ever before. Ball so hard spheros tough polycarbonate shell protects the advanced tech inside. Drive the revolution sphero is propelled by an electric motor - rolling up to 4.5 mph. Li-Ion (included). For ages 5 years and over. WARNING(S): Not suitable for children under 3 years old.