OCEAN REEF GSM Mercury Underwater Communication Unit
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OCEAN REEF GSM Mercury Underwater Communication Unit
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OCEAN REEF GSM Mercury Underwater Communication Unit

$799.95
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Dual-channel wireless communication unit.

Micro USB rechargeable, roughly 30-hour dive time, user-replaceable battery. Ocean Reef markets this as combining features from several of its earlier communication units into one -- worth confirming compatibility with whichever full-face mask or communication accessory you already use, since these systems generally aren't universal across brands.