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Simplest way to communicate to one diver through a hardwire connection Surface unit is self contained and compact size 20 watts of power for clear communication Easy to use controls: Push to talk and adjustable volume External connection allows recording communications Uses 16 AA Alkaline Batteries (6 hours continuous use) Optional rechargable batteries and charger Connection to run from an external 12 volt battery Size: 9" x 7.8" x 3.4"