Water Pebble, Inspired by a hotel sign to "please use water sparingly", the Water Pebble is the easy way to reduce water usage in your shower. The clever device sits over your shower drain and signals you via a series of gently flashing lights when your shower is almost over and when it's time to get out. It's like a traffic light for your shower, green means you're good, yellow means it's time to finish up and red says turn off the water. So small, it's easy to just set it and forget it; a perfect reminder to keep your showers short and conserve water. buy now »