This will get family and friends to conserve water by taking shorter showers. As water conservation becomes increasingly essential, this great water-saving device will train you to save water while showering. The Shower Coach™ shower timer times exactly 5 minutes, showing you when it's time to turn the shower off.  Requires no assembly or maintenance. Large suction cup for great holding power. Simply rotate shower timer half a turn when you start your shower; stop shower when the last grains of sand fall. Measurement: 4 1/2"