Used Ocean Reef GSM Mercury Communications Unit Condition:Very Good This light also features a

This light also features a built-in Blue and Red LED function

It combines advanced features such as an air-balanced flow-through piston and user-adjustable controls to support divers in cold

The magnetic end-stopper prevents unwanted rattling when you need to keep quiet

Additional features include a High Flow Purge with a large diameter purge valve for quick clearing

Used Ocean Reef GSM Mercury Communications Unit Condition:Very Good This light also features aThis unit is blending four different OCEAN REEF units into one: the extended range of the Gpower, the like stereo sound of the GSM SL, the clearness and double channel option of the DC and the battery life of the Gdivers.