Can this be used with line phones or wireless phone at home by plugging it into the ear phone jack?

No- it has a special adapter that is proprietary to certain phones- NOT a standard jack

can this headphone be used with a cordless phone (2.5mm jack)?

It depends on your cordless phone and what size jack it has. Most have 2.5mm but not all. However, I was not thrilled with the quality of this headset at all and wouldn't recommend it.

Questions & Answers: Plantronics HW301N EncorePro Binaural Headset

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Plantronics HW301N EncorePro Binaural Headset

Binaural
Sliding boom
Wideband audio

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