ervice:Fume hood face velocity air flow.Alarm Range:30-400 FPM (0.15-2.0 m/s).Alarm Indication:Red LED & audible alarm.Low Air Velocity Alarm Delay:Fixed 5 secs.Visual LED Display:Red: Alarm; Green: Normal.Horn Silence:Yes, temporary and permanent.Accuracy:Face velocity ±10%.Temperature Limits:Operating temperature: 55 to 86°F (13 to 30°C). Storage temperature: -40 to 150°F (-40 to 65°C).Power Requirement:15 VDC 500 mA; 120 VAC, 60 Hz power transformer included.Relay Output Low Air Flow Alarm:5 A @ 250 VAC.Relay Input for Night Setback:2 wire rated for 24 VDC usage.Sash High Indication:Using a two wire micro switch or 3 wire proximity switch input, rated for 24 VDC usage.Mounting:Semi flush, flush or surface mounted when using included bracket.Weight:5.0 oz (141 g).Agency Approval:CE.