They plug directly into your headset-ready telephone! What's in the box headset shown above, plus a 10-feet cord. That has a modular plug no the other end. Meridian pbx m3903, m3904, m3905, m2216, m2008, m2616. Meridian norstar m7208, m7310, m7324, t7208, t7316, m7900. Electra elite dterm, series e, models dtu-8, dtu-8d, dtu-16, dtu-16d, dtu-32, dtu-32d, dpt-8, dpt-8d, dpt-16, dpt-16d, dpt-32, dpt-32d. superste 4000 series, models 4015, 4025, 4125, 4150. Optiset e series with ca or ha option modules.

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