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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
Inflate at depth to send up as a surface marker
All markers are small enough when deflated to fit in a pocket or MC Storage Pak