Kids think finding small objects at the bottom of the pool is a chance for adventure, but we all know losing your keys in the lake while jet skiing can ruin your week as an adult. That is, of course, unless you had the foresight to keep a WaterBuoy ($13) clipped to your key chain. This small device can help any object weighing up to 1 kg stay afloat for 24 hours by automatically inflating a durable rubber balloon when it detects being submerged in water. An included LED illuminates the balloon too, helping boaters locate lost objects at night. The best part is that it’s sensor can distinguish the occasional splash from actually being lost a sea, so there’s no need to worry about an accidental inflation ruining your chances with the ladies.
Buy Now: $13