NEC LCD4000 - Manual (Page 10)

English-8
Point the top of the remote control toward the LCD monitor’s
remote sensor during button operation.
Use the remote control within a distance of about 7 m from
the front of the LCD monitor’s remote control sensor and at
a horizontal and vertical angle of within 30° within a distance
of about 3 m.
Operating Range for the Remote Control
Caution: Important the remote control system may not
function when direct sunlight or strong
illumination strikes the remote control sensor of
the LCD monitor, or when there is an obstacle in
the path.
Handling the remote control
* Do not subject to strong shock.
* Do not allow water or other liquid to splash the remote
control. If the remote control gets wet, wipe it dry
immediately.
* Avoid exposure to heat and steam.