Same features as H171, but with
noise-cancelling microphone that reduces background noise you transmit to your callers.
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
OFFICE PHONES 
VoIP PRODUCTS 
When 2 or 3 handsets is enough...