12 SIP accounts. New design. Backlit color screen: 2.8" 320x240px. Built-in Bluetooth 2.0. USB 2.0 for recording and connecting wireless headphones. Codec Opus. Firmware of T54S & T52S and unified Auto-P template. Dual Gigabit port (IEEE 802.3af), Class 3. Wi-Fi via WF40. Support adjustable to two angles.