This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics 86007-01 Telephone Interface Cable, Conductor Copper, Phone Headset, Compatible to CS510, CS520, CS530, CS540, W710, W720, W730, W740.
The Poly/Plantronics Spare Telephone Interface Cable is purposely made in order to enhance personal communication. It will provide well-improved clarity communication and help people to become more productive to daily tasks and operations.