Environmental CharacteristicsPower Management ModesIf you have VESA's DPM™ compliance display card or software installed in your PC, the monitor can automatically reduce its power consumption when not inuse. This is referred to as Power Save Mode*. If the computer detects input from keyboard, mouse, or other input devices, the monitor automatically resumesfunctioning. The following table shows the power consumption and signaling of this automatic power saving feature:U2211HU2311HThe OSD will only function in the normal operation mode. When any button is pressed in Active-off mode, one of the following messages will be displayed:Width 514.4 mm (20.25 inches) 547.97 mm (21.57 inches)Depth 65.00 mm (2.56 inches) 65.00 mm (2.56 inches)Stand dimensionsHeight (extended) 363.60 mm (14.31 inches) 370.47 mm (14.59 inches)Height (compressed) 323.50 mm (12.74 inches) 331.32 mm (13.04 inches)Width 279.90 mm (11.02 inches) 279.90 mm (11.02 inches)Depth 184.10 mm (7.25 inches) 184.10 mm (7.25 inches)WeightWeight with packaging 16.85 lbs (7.65 kg) 18.14 lbs (8.23 kg)Weight with stand assembly and cables 14.22 lbs (6.45 kg) 15.45 lbs (7.01 kg)Weight without stand assembly(For wall mount or VESA mount considerations -no cables)9.97 lbs (4.52 kg) 10.34 lbs (4.69 kg)Weight of stand assembly 3.88 lbs (1.76 kg) 4.06 lbs (1.84 kg)Model U2211H U2311HTemperatureOperating 0° to 40 ° C 0° to 40 ° CNon-operating Storage: -20° to 60° C (-4° to 140° F)Shipping: -20° to 60° C (-4° to 140° F)Storage: -20° to 60° C (-4° to 140° F)Shipping: -20° to 60° C (-4° to 140° F)HumidityOperating 10% to 80% (non-condensing) 10% to 80% (non-condensing)Non-operating Storage: 5% to 90% (non-condensing)Shipping: 5% to 90% (non-condensing)Storage: 5% to 90% (non-condensing)Shipping: 5% to 90% (non-condensing)AltitudeOperating 4,850 m (15,902 ft) max 4,850 m (15,902 ft) maxNon-operating 12,192 m (40,000 ft) max 12,192 m (40,000 ft) maxThermal dissipation 187.67 BTU/hour (maximum)75.07 BTU/hour (typical)235.44 BTU/hour (maximum)112.60 BTU/hour (typical)VESA Modes Horizontal Sync Vertical Sync Video Power Indicator Power ConsumptionNormaloperationActive Active Active Blue 55W (maximum) **22W (typical)Active-off mode Inactive Inactive Blanked Amber Less than 1.0 WSwitch off - - - Off Less than 1.0 WVESA Modes Horizontal Sync Vertical Sync Video Power Indicator Power ConsumptionNormal operationActive Active Active Blue 69W (maximum) **33W (typical)Active-off mode Inactive Inactive Blanked Amber Less than 1.0 WSwitch off - - - Off Less than 1.0 W