Darkside by Sphero
Meet Darkside - Devious. Defiant. Diabolical. Dangerous. This is Darkside – an electrical beast that draws its energy from unrestrained competition and reckless abandonment. Command this app-enabled robot with these forces to unleash its unrivaled power. But take heed – the Darkside will overpower anything standing in the way of victory – including its master. You have been warned.