Siemens CENTRA 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, credit cards, video/audio tapes, and other elec-
tronic equip-ment. 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 a 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).
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