Yealink Revolutionary smart business phone, Runs Android 9.0, 7 inch (1024 x 600) capacitive adjustable touch screen, Delivered with wired handset, Supports Yealink Bluetooth Handset BTH58 (Optional), 720p30 HD video, 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, Up to 16 VoIP accounts, Up to 3-party video conferencing, Up to 10-party video/audio mixed conferencing (up to 2 video calls), Dual-port Gigabit Ethernet, supports PoE, Wall mountable, Supports up to 3 Expansion Module EXP50, Supports Yealink/Unify Square Device Management Platform.