The Yealink SIP-T58W is a simple-to-use smart business phone that provides an enriched HD audio and video calling experience for business professionals. This smart business phone enables productivity-enhancing visual communication with the ease of a standard phone. With the optional Yealink Bluetooth handset BTH58, users are free to move around when on a call – no more missed calls when they leave their desk. " 1024x600 pixel capacitive adjustable screen, 2 x Ethernet ports 10/100/1000 PoE support, 720p30 HD video calling (with optional CAM50), 2 x USB 2.0 ports for USB headset, media and storage applications, Up to 16 SIP accounts, Supports up to 3 expansion modules (optional - EXP50).