Dive alert plus v.2
*Dive Alert PlusÂ uses a small amount of air from your scuba tank to make a piercingly loud sound in air or water.
*People have been able to hear a Dive Alert PlusÂ one mile away from a diver in need above water. In conditions where visibility is limited, a Dive Alert PlusÂ can be a life saver.
*Underwater you can sound for attention quickly with a squeeze of the device.