ViewSonic PA503HD User Manual page 16

Remote Control - Receiver Range
To ensure proper function of the remote control follow the steps below:
1. The remote control must be held at an angle within 30° perpendicular to the
projector's IR remote control sensor(s).
2. The distance between the remote control and the sensor(s) should not exceed 10
m (32.8 ft.).
NOTE: Refer to the illustration for the location of the infrared (IR) remote
control sensor(s).
Approx. 30°
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