Halcyon Super Big Diver Alert Marker 1.8m from the Halcyon's series of Diver Alert Markers provide maximum visibility and redundant flotation at the surface.
Open water divers should always carry a marker buoy they can send up in the event of separation from buddy, primary group, or boat.
Halcyon Diver Alert Markers feature closed-circuit (one-way valve) construction Inflate at the surface to attract attention.