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WARNING
To prevent fire or shock hazard,
do not expose the unit to rain or
moisture.
To avoid electrical shock, do not
open the cabinet. Refer servicing
to qualified personnel only.
WARNING
You are cautioned that any changes or
modifications not expressly approved
in this manual could void your
authority to operate this equipment.
Owner's Record
The model number is located at the
bottom of the transmitter and the right
inner side of the headband.
The serial number is located at the
bottom of the transmitter and in the
battery compartment of the
headphones.
Record these numbers in the spaces
provided below. Refer to them
whenever you call upon your Sony
dealer regarding this product.
Model No.
Transmitter
Headphones
Serial No.
Transmitter
Headphones
2
Welcome!
Thank you for purchasing the Sony
MDR-IF420RK/MDR-IF520RK
Cordless Stereo Headphone System.
Before operating the unit, please read
this manual thoroughly and retain it
for future reference.
Some features are:
• Cordless system that allows you to
listen to a program free from the
restriction of a cord.
• The infrared rays from the
transmitter cover a broad horizontal
listening area with a maximum
distance of 10 m.
• Self-adjusting headband for fitting
your head perfectly.
• The power of the headphones turns
on and off automatically every time
you put the headphones on and off
(Auto power on/off function).
• Surround effect that enables you to
enjoy the sound which simulates the
sound field such as concert hall or
theater. (MDR-IF-520RK only)
• The VOL control adjusts the volume
level of both channels.
Furthermore, you can adjust the
balance between the left and right
channels with the BALANCE control.
(MDR-IF520RK only)
• The power source of the headphones
can be selected from either a supplied
rechargeable battery or a
commercially available R6 (size AA)
dry battery.
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