The Shower Saver (Water Resistant Shower Timer with Automatic Start Stop and Virtual Water Level) Virtual water-level displays your shower time and water use graphically, making it easy to follow and empowering you to make the sustainable decision. Automatic Start/Stop means you never have to forget to turn it on or off. Just get in and start showering! Easy installation, operates independently of plumbing Ability to set customized shower time or water usage goals Comes with rechargeable AA batteries which provide long-life