The WaterBuoy is a new device which attaches to your key ring and is capable of keeping afloat up to 1 kilo in weight. Inside the WaterBuoy you will find a few components which make the device activate when it comes in contact with water. The first part of the key ring holds the gas which fills the balloon. Above that is the trigger which does not set off when splashed, but when fully submerged the trigger sets off the gas which fills up the strong balloon bringing the keys or other dropped (attached) items up to the surface.
This makes dropping your keys in the water a less problematic adventure. For those regular water users this could save a ton of hassle for a small price.
The WaterBuoy costs £12.99 and is available over at the Water-Buoy site.