Caution with magnets. Magnets can affect the operation of pacemakers and implanted defibrillators. As wearers of such devices, keep an adequate distance from magnets. Warn wearers of such devices not to go near magnets. Magnets can damage televisions and laptops , computer hard drives, credit and EC cards, digital storage media, mechanical watches, hearing aids and speakers, among others. Keep magnets away from all devices and objects that can be damaged by strong magnetic fields.