New look, slick re-design of the original, audible surface signal. DiveAlert is a specially designed, small, lightweight air horn that uses quick-connect/disconnect hose couplings to become an integrated part of your power inflator, breathable/inflator and buoyancy compensator. Installation is easy and only takes a moment. Why have DiveAlert? What would you do in a diving emergency if you needed to get the attention of the pick-up boat or someone else on the water's surface? Before DiveAlert SCUBA divers had relied on whistles or a SMB (surface marker buoy) as their only signaling devices in such an emergency. But if the diver is disabled and can't blow into a whistle (or deploy the SMB) the whistle makes no sound at all. Or if the boat operator is not looking in the direction of a diver with a SMB deployed (if the diver was able to even deploy the SMB) the diver goes unnoticed. Equally frustrating (and dangerous), if a diver needs to attract the attention of someone who is too far away to hear the whistle, the whistle is of no help. In contrast, Dive Alert enables divers, at the mere touch of a button, to generate a blast of sound that can be heard up to a mile away! There are three different models available; one for approximately 85% of standard power inflator mechanisms model DB1. There are several breathable/inflator mechanisms that require a larger coupling for a higher flow of air so there are two models to accommodate them. The model DB2 and the model DB3