An updated, redesigned version of Aquatec's Sub Alert, the Scuba-Alert Type II Horn from IvTv (Innovative Scuba Concepts) just may save your life if you run into trouble on a dive. It works both beneath the surface and above it, making a sound loud enough to be heard 0.5-1.0 mile away when above the water. The unit is compatible with the following inflators on buoyancy compensation (BC) devices: ScubaPro Air II, Sherwood Gemini, Tusa Duo-Air, Dive Rite Rite Source, H2Odyssea Inflator Plus, Zeagle Octo-Z, and Atomic SS1. It allows for an easy, in-line connection to your low-pressure hose and power inflator. The horn offers an intuitive button design for simple activation.