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Ocean Reef M-105 Dual Channel Transceiver Surface Unit -Surface to Diver is similar to the M-105 Digital Unit -allowing the surface personnel to communicate with people underwater and vice versa- with the addition of a second channel.
The 6v DC battery operable unit gives up to 48 hours of use time. Or it can be hardwired to 12v DC source.
Unwanted battery loss is prevented by the system activation, which takes place only when the transducer.
A recorded message informs the operator which channel is in use when switching in between them.