Davis Instruments Key Buoy Never Lose Keys in the Water Again! When keys fall in the water, Key Buoy pops open and air tube inflates Tube carries keys to the surface for easy retrieval Suitable for items weighing up to 2.8 oz. (80 g) Key sets, Small tools and Deck plate key Suitable for single use only. Activator is sodium bicarbonate and tartaric acid, a mild irritant. Not a toy. Prevent contact with eyes and skin; avoid inhalation. Activated product should be promptly disposed. Recyclable. Stays afloat for over an hour