This product is either discontinued or we cannot get that from suppliers.
Yealink CPE80 Expansion Microphone for IP Phone, Optima HD voice, full duplex technology, Muting the microphones with touchpad, Bi-color LED, 10-feet (3-meters) 120°H voice pickup. With the additional expansion microphones, the CP860 is the ideal conference phone for medium to large size conference room that need extended coverage at the far ends of a conference table.