Yealink SIP-T58W Pro , 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 , Up to 16 VoIP accounts , Up to 10-party audio conferencing , Dual-port Gigabit Ethernet, supports PoE , Wall mountable , Supports up to 3 Expansion Module EXP50 , Supports Yealink/Unify Square Device Management Platform