Unfortunately useless for me

Unfortunately useless for me

Sennheiser PC 121 In-Ear Headset (Personal Computers)
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Customer Review

Tested've briefly's unfortunately can not use.

The called party say they hear yourself (echo). Looking back can control the volume, so that does not occur, I no longer hear my interlocutor. My hearing is normal: - \

Unfortunately I have to return the headset.

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