... /A and paging for various vessels,ports, platforms,etc. HKD PA system is used for commanding, communication, talk-back, G/A and ... outputs: loud-hailing, machine area, indoor, outdoor.Talk-back among PA main unit, remote station and talk-back station.When the ... optional.Use VHF wireless talk-back station to control the PA to output through one or several ways of speakers. (Customized ...