Yealink CP925 IP Conference Phone 4'' 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 Built-in 6-microphone array for 360-degree voice pickup Built-in microphone for noise cancellation Full-duplex speakerphone with AEC Phone Features 5-way conference call 3-way PSTN conference via Yealink CPN10 (optional) Connectivity Built-in Bluetooth/Wi-Fi Power over Ethernet (IEEE 802.3af ), class 3 1 USB2.0 Type C port Advanced Features Supports one Bluetooth wireless expansion microphone CPW25 (*pending) Supports Yealink Device Management Platform