Horn works both UNDERWATER and on the SURFACE
Volume: Approx 120 dB. (Above water range approx 0.5 - 1.0 mile)
Requires just a tiny bit of air to activate the underwater horn.
Horn is very loud above water. Keep away from ears at all times.

The Sub-Alert is an underwater horn that allows you to signal your dive buddy effortlessly by the press of a button. This horn generates a loud "quacking" sound by using tiny pulses of air to rapidly vibrating a steel disk. Use this underwater horn to get your dive buddy's attention both in emergency situations or just to show him something interesting.