We try and keep our shower-time water consumption down for the good of the environment and our utility bills. But we'll admit that it's tough to get a grip on exactly how much water you're sending down the drain when you just need "another 5 minutes." The Waterpebble wants to help.
When you place it by the drain during your first Waterpebble-chaperoned shower, it memorizes the time you shower and the amount of water flowing out the drain, then uses that as a benchmark. From then on, Waterpebble will train you to take shorter showers that use less water with a "traffic light system."
A flashing green light on the Waterpebble means you're good to go. A yellow light means that it might be time to start rinsing the conditioner from your hair, and a red light means that it's time to get out.
If you're interested in being bossed around by a flashing showerbot in the name of Mother Nature, grab a Waterpebble from Dry Planet for only $8.