Smart Business Phone* Runs Android 9.0* 7 inch (1024 x 600) capacitive adjustable touch screen* Delivered with wireless bluetooth handset BTH58* 720p30 HD video (with CAM50, optional)* Optimal HD audio, Yealink Noise Proof Technology* Yealink's SDK (Software Development Kit)* DoorPhone Features (Preview, One-button Open, Monitoring)* Built-in Bluetooth 4.2 and Dual Band 2.4G/5G Wi-Fi* 2 x USB 2.0 ports for USB headset, media and storage applications* Opus Codec support* U