AQUATEC DUO-ALERT Scuba and surface horn
Scuba and surface horn AQUATEC DUO ALERT.
Alert maker with two alert makers.
One with a buzz tone for underwater 115-125 db and one for surface with high pitch tone 125-130 db.
For international LP connection.
Never use close from the ear and for a duration time.
The maintenance is easy to realize as shown in the video below :