The concept of the Shower Brake is simple. The developers realized that we all waste a lot of water so you can either use the bare minimum and conserve or go hog wild and not feel good about your water choices. The brake starts by pushing the water controller up and a pre determined amount of water starts to spray. It looks like an hourglass so you will know how much water you are using and therefore how much time is left. At the end you can push it up again or get out and dry off.

Via: Yanko Design