Oppo PM-1 - Manual (Page 3)

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Important Safety and Usage Information
Before using your headphones, make sure to lower the volume
level on your headphone amplifier or portable device. You can
then raise the volume to your preferred listening level. Please be
aware that prolonged exposure to high volumes may result in
temporary or even permanent hearing loss.
Be aware of your surroundings. Using headphones may diminish
your ability to hear important ambient sounds. Exercise caution
particularly at railway tracks, crossroads, pavements, or any
environment where motor vehicles or bicycles are present.
Turning your audio system on and off, changing inputs, and
connecting or disconnecting the headphones from an audio device
may result in audible high-frequency clicks or pops that may affect
your hearing at high volume levels. It is always recommended to
lower the volume level prior to connecting or disconnecting your
headphones.
Do not leave your headphones or cables in an area where people
or pets might trip over them.
Do not attempt to disassemble or repair the headphones. Service
should only be completed by a qualified OPPO technician.
Always supervise children who are using these headphones.