The Duopro family has four members, all of which offer best-in-class sound quality and comfort. Ergonomic design for all-day comfort. Leading-edge microphone and speaker quality. Quick disconnect cord.

The H151 is the over-the-ear model. For the headband model, see thre H161. For a convertible model, which allows both configurations, see the H171.

The new H181 is a behind-the-head model

Unit comes with a QD connector and connects to phones as follows:

• For single or multi-line corded phones without built-in headset jack, purchase the PLA-M12 adaptor (see Accessories below)
• For Nortel corded phones only with built-in headset jack, purchase the P-version of this headset
• For phones with a dual-prong ACD adaptor, purchase PLA-P10 adaptor (see below)
• For corded phones with a built-in 2.5mm headset jack, purchase the PLA-43038-01 adaptor cable (see below)
• Use with digital spread spectrum cordless phones may result in unsatisfactory sound quality -- connect at your own risk. The only H-series headset approved for DSS cordless use is the PLA-H51NS

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