Yealink CMKit-121
•  1x    CM20  Ceiling  Microphone  with  Install  accessories
Beamforming Ceiling Array Microphone for Unmatched Audio Clarity
Advanced Microphone Array
Superior Coverage
Intelligent Sound Processing
Intelligent Tracking
•  2x    CS10  Ceiling  Speaker  with  Install  accessories
2-Way Coaxial Networked Ceiling Loudspeaker for Exceptional Sound Quality
Acoustically tuned design for speech
Innovative Coaxial Structure
PoE-Enabled Active Speaker
Versatile Deployment
Sophisticated Design
•  1x  RCH40  E2
RCH40 E2, Better Connection 
Up to 90w PoE Budget
4x 10/100/1000Mbps Port
802.3af/at-compliant
QoS, 
PoE Priority Control
 Including  2-year  AMS