Protects your stuff from EM radiation and stuff, but is this really a concern in e.g. a PlayStation 2? Are they a relic from the past? Is there any proof of them harming electronics?
Back in 90s early 2000s I knew my cellphone was going to ring because my speakers would make noise. The vacuum would mess up the TV picture. I remember we had something to close to a old plasma TV and turned the corner purple. So some reasons.
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