The ultimate key FOB for boaters. When keys fall in the water, Key Buoy self-inflating key ring opens up, releasing an air tube which inflates automatically. Within 30 seconds your keys rise to the surface, and the extra-long 14-inch inflated tube extends above the water, alowing you to reach over and pick them up. Strong enough for items weighing up to 4.2 ounces (that's about 3-4 keys on a ring) such as car keys, small tools, deck plate keys. Suitable for single use only, so keep a spare on hand.