"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 • 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 without PSU"