Designed for Effective, Easy Use Dive Alert is a specially designed, small, lightweight air horn that uses quick - connect/disconnect hose fittings to become an integrated part of your power inflator. Installation is easy and takes only a moment. Dive Alert does not require any modification of your other equipment, and it does not interfere in any way with the normal operation of your other equipment. When you need to get someone's attention on the water's surface, you simply press a button and Dive Alert uses a small amount of air from your tank to make a piercingly loud sound.