Siemens hearing systems User Manual page 17

Note:
Magnets can pose risks to electronics and magnetic storage
mediums when placed in close proximity. Take care not to
set magnets near computers, color monitors, television sets,
floppy discs, video/audio tape and other electronic
equipment.
Keep magnets away from the reach of children. If swallowed
consult your physician.
Magnets may interfere with the operation of life supporting
systems (i.e. pace-makers, magnetic valves etc). Use magnet
only if not in doubt about the safe distance.
The Safe distance between pacemaker and magnet should
be at least 10 cm (4 inch).
17