The ultimate key fob for boaters and lakeside loungers! When keys fall in the water, Key Buoy self inflating key ring by Davis Instruments opens up, releasing an air tube which inflates automatically. The 14 in 47 cm inflated tube extends above the water, allowing you to reach over and pick them up. Key Buoy rises to the surface in as fast as 60 seconds. May take longer in deeper water with maximum weight attached. Strong enough for items weighing up to 2.8 ounces 80 grams such as keys, small tools, deck plate keys. Suitable for single use only, so keep a spare on hand!