The downshifting throttle blips are more audible. The transmission can skip gears when downshifting. It controlled speed only through throttle control and downshifting, but did not apply the brakes. It has a "back torque limiting" clutch that allows for slicker downshifting. The catch-phrase of International Downshifting Week is "Slow Down and Green Up". On an individual level, work downshifting is a voluntary reduction in annual income. The trivalent dysprosium ion (Dy) has been studied due its downshifting luminescence properties. Downshifting is not an isolated or unusual choice.