Encore: H91, H101 / TriStar: H81 / DuoSet:H141 / DuoPro: H151, H161, H171, H181. DuoPro H151, H161, H171, H181. DuoSet H141. This VoiceTube works with the following Plantronics Headsets. SupraPlus: H251, H351, HW251, AH450,H261, H361, HW251, AH460.
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