... for used on-boarad ships for send or answer the main engine speed order between wheelhouse and engine control room. It ... kinds vessels.FEATURES1.Order steps: full, half, slow, dead slow, standby, stop, few, dead slow, slow, half, full.2.Serial communication: Cable with ... alarm and output the close contact. When the main power is recovered, the alarm will be stop.4.Dimmer: adjust to suitable light. ...