Sony CRE-C10 Maintenance Information page 22

NOTICE
Your devices comply with international standards.
However, it cannot be guaranteed that all products on
the market work interference-free, for example some
induction cookers, electromagnetic security systems
(e.g. anti-theft systems and metal detectors) cellular
telephones, RFID, room surveillance systems may
cause audible interference. If you encounter unwanted
noise in the vicinity of such device, you should
increase the distance between the hearing aid and
that device.
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