Yealink Microsoft Certified Conference Phone Without Expansion Microphones. General Features • Android 11 • 5'' capacitive touch screen • Black acoustics fabric, resistant to water/oil/stain Audio Features • Optimal HD audio • Yealink Noise Proof Technology, Smart Noise Filtering • 20-foot (6-meter) microphone pickup range • 12 built-in 12-microphone array for 360-degree voice pickup • 1 built-in microphone for noise cancellation • Full-duplex speakerphone with AEC Phone Features • Single sign-in • Visual voicemail • Change VM playback speed Connectivity • Built-in Bluetooth/Wi-Fi • Power over Ethernet (IEEE 802.3at), class 4 • 1 USB 2.0 Type A port, 1 x USB 2.0 Type-C port