Yealink CPW90 Wireless Expansion Mic Package Suits MVC Systems - Inc the DD10K, DECT, HD Voice Quality, Echo cancellation, Full Duplex TechnologyBring a wireless microphone solution to your MVC500 and MVC400 Meeting room MTR on Windows system. Add the CPW90 to have up to 4 wireless microphones kitted out for greater coverage. The Yealink CPW90 PKG is a Wireless Expansion Microphone solution that works as an audio input device for Yealink's MVC500 and MVC400 series MTR on Windows room systems. It features superior audio technology and supports 360 degree voice pickup range at a radius of up to