Panasonic RP WH20 - Manual (Page 6)

Installation
These headphones use an infrared beam. The
approximate area in which the infrared beam
from the transmitter (beam emitter) can reach the
headphones (beam sensor) is shown in the fig­
ure. Install the infrared beam transmitter inside
the area indicated,
.Notes.
•The infrared beam does not pass through walls
or window panes. The headphones must be
used where the infrared beam transmitter is di­
rectly visible without any obstructions.
•Do not expose the headphones to direct sun­
light or to the bright light of an invertor fluores­
cent light.
Maintenance
To clean this unit, wipe with a soft, dry cloth.
If the surfaces are extremely dirty, use a soft
cloth dipped in a soap-and-water solution or a
weak detergent solution.
• Never use alcohol, paint thinner or benzine to
clean this unit.
•Before using chemically impregnated cloth,
read the instructions that came with the doth
carefully.