Webber explains KERS and DRS

As well as the new Pirelli tyres, a pair of technical novelties will be in action to help improve overtaking in Formula 1 this year. Reigning Champions Red Bull Racing allow us to take a detailed look at the Kinetic Energy Recovery System (KERS) and Drag Reduction System (DRS) – also known as Adjustable Rear Ring. Narration from Red Bull's Mark Webber.