If you thought a screaming phone call from your downstairs neighbor was the only way to know if you had a water leak, meet AquaOne Technologies' H2Orb. It'll let you know when you've got a leak or an overflow in your toilet, and it won't steal your mail.
The H2Orb electronic water valve attaches directly to the water valve behind the toilet, while a single float sensor hangs inside the toilet tank. When it spots a leak, it shuts off the water and alerts the user of the leak with an audible alarm and an icon displayed its LCD screen. The whole system operates on a single 3V lithium coin cell battery.
While wasting water isn't a huge problem in much of the U.S. yet, as water prices rise in places with limited resources, the H2Orb could save this precious resource and save users hundreds of dollars a year.