Whenever you shower you use water and energy energy to heat the water and perhaps also to pump it. You have to pay for that energy through your gas or electricity bills and of course you pay for the water used. But there's not just a financial cost. As you use water you reduce the level in our reservoirs and aquifers. And the energy you use means more CO2 is emitted into the atmosphere. More.This easy to use, battery operated shower timer can help you cut down. It is steam proof and waterproof, with a strong suction cup that holds it fast to any non porous surface, such as bathroom tiles. You decide how long you want to spend in the shower and the timer will sound the alarm when your time is up.