... satety type. Ex mark: ib II CT 6 FEATURES(1) Remote control function: there are four keys on the panel:, i.e ... , ENGINE RM, CABIN/PASS. The user can paging through the remote control station and press one of these keys to output.(2 ... on the panel to talk-back with other station.Outline and mounting dimension Explosion-proof remote control station, talk back station, public address ...