Toshiba a500 Series User Manual page 63

* The appearance of the provided Remote Controller may vary from model
to model.
Even if the remote controller is within the effective range as described
above, it may malfunction or not work correctly in the following cases.
When an obstacle stands between the infrared receiver window of your
computer and the Remote Controller.
When direct sunlight or strong fluorescent light strikes the infrared
receiver window.
When the infrared receiver window or the infrared emission part of the
Remote Controller is dirty.
When other computers which use an infrared remote controller are
used near to your computer.
When a low battery condition is present.
User's Manual
Figure 2-11 Operational range of the remote control
A500/A500D series
2-23