Headset for use with landline (Beaconsfield HP9)

Plantronics wireless headset [product C65 DECT] complete with charging unit and Quick Start Guide. It has worked fine for many years - not required anymore as not using landline. Needs to be 'paired' with phone, then can make and answer calls. Has in the past been used with calls lasting up to an hour. Collection from Beaconsfield. Offering again as Freegler to whom promised was repeated 'no-show'.