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Title: Barely works, nasty feedback
Review: Going by the Plantronics name I bought a pair of M60 headsets to use on a cell and a miniphone. They are incredibly cheaply made, and when my wife gave them a try she got a NASTY feedback squeal several times during a long call. Essentially unusable, unless we find some trick that we have missed so far. We ordered a Sennheiser PC120 to try instead.
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