Whats in the box: Double Barb Tip, Retaining Line, Rubber Line Shock, Shaft, Shaft Loader, Recharging Pump, Leg holster - - - - - - - - - - - - - - - - - - - - - - - - - The requirement of having safety signal devices has become a standard for safe diving and in many instances you won't be allowed to dive without them. Hanging of extra gear here and there can be a hassle. Combining equipment can be the simplest and most convenient way to go. Mares has addressed this; the new semidry snorkel with an inventive safety feature! This snorkel has a built in whistle making it easily accessible and always there when needed.