Earphones give problems to pacemakers.

The Ipod earphones, clips or buds can cause irregular heartbeats when put close to the chest where the pacemaker sits, or defib unit too.
They said some of these earbuds using neodymium magnets have field strength as high as 200 gauss! It only takes 10 gauss to effect these heart devices. I wonder about the safety of credit cards put next to these buds, I bet it could contaminate the data on them rendering them useless.

http://www.physorg.com/news145450558.html