To help you save water instead of electricity.
Designed by Paul Priestman, the “Waterpebble” is an innovative device that keeps an eye on water consumed when you take shower in the bathroom. Designed to be fully recyclable, the smart device monitors water going down the plughole, after each shower, to compare it with earlier showers, so you could manage or reduce your shower time and thus water consumption. Featuring an automatic mechanism, the Waterpebble takes your first shower as a benchmark and gently flashes “from green through to red” to stop the shower.
More at Design Blog. Hat tip: David Tannenbaum.