Dell C8621QT User Manual page 32

Operating range of the remote control
Point the top of the remote control toward the LCD display's remote sensor during button opera-
tion.
Use the remote control within a distance of about 7 m from remote control sensor or at a hori-
zontal and vertical angle of within 22.5° within a distance of about 7 m.
NOTE: The remote control may not function properly when the remote control sensor
on the display is under direct sunlight or strong illumination, or when there is an
obstacle in the path of signal transmission.
32 | Setting Up the Display