This is Avaya Certified wireless headset bundle.  The package includes the Plantronics CS540 + Avaya EHS Remote Answer Adapter. This bundle has been pre-tested and certified by Avaya to be compatible with Avaya IP phones (models listed below).  It includes the Avaya adatper for remote Answering. This bundle allows the Plantronics CS540 to answer the Avaya IP phones remotely, up to 300ft away, Plantronics CS540 wireless headset is one of the the lightest office wireless headset on the market. It comes with two wearing styles, no matter what style you like.  Change it any time you want.

Compatible with Avaya IP Phones models:

2420 
4610 4610SW 4620 4620SW 4621 4621SW 4622 4622SW 4625 4625SW 4630SW 
5420 5610 5620 5621 

(do not order this product if your Avaya phone is not listed above)

Key Features:

• Avaya EHS remote answer adapter included
• Noise canceling mic to block out background noise
• Over-the-ear or Over-the-head styles (both included)
• Up to 350 feet range
• 7 hours of talk time when fully charged
• Adaptive power system optimizes for range and talk time
• Both narrowband or wideband are available
• One Year warranty

For more details, see Plantronics CS540 datasheet & Plantronics CS540 user manual