Returnstar Interactive Tech IQTouch TB1100 Pro Series User Manual page 4

 Please don't display the high brightness image on the screen for a long time.
Sight Distance
 The best distance between audience and screen is 5-7 times that of screen
diagonal.
 The best watching angle between audience and screen is within 178 °
Temperature
 Do not place the unit near or over a radiator or a heater register.
 If your unit is suddenly moved from a cold to a warm place, unplug the power
cord for at least.
 Two hours so that moisture that may have formed inside the unit can dry
completely.
 Normal operating temperature is 0 ~ 40℃.
Humidity
 Do not expose machine in rain, damp or place near water.
 Ensure the indoor drying, cool.
Ventilation
 Keep the ventilation openings clear.
 Ensure that the unit has enough space for ventilation around: left, right and
back >10cm, top> 20cm.
Earphone
 It will affect the hearing if you listen to noisy sound for a long time.
 Before using earphone, please turn down the volume in advance.
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