... kinds vessels.FEATURES1.Order steps: full, half, slow, dead slow, standby, stop, few, dead slow, slow, half, full.2.Serial communication ... alarm signal and output the close contact.3.Power failure alarm: when the main power supply 220VAC is failure, it will change ... visual alarm and output the close contact. When the main power is recovered, the alarm will be stop.4.Dimmer: adjust ...