This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Spare Binaural Over-the-head Headset 86920-02, Full size, Wireless - DECT 6.0, Microphone Boom, Controls Mute, volume, answer/end, Range 107m, Headset battery - rechargeable.
Plantronics legendary CS family is setting a wireless standard for desk phone communication with the CS500 series. The system features the light DECT headset on the market, a streamlined design and improved performance.