Core Features: Linux 6.1 version. TEE hardware encryption solution. Dual system function. Unified firmware for T7X series (T73U, T73W, T74U, T74W, T77W), T85W, and T87W. Up to 16 SIP accounts. PoE support. Support USB headset and EHS. Built-in Bluetooth, Wi-Fi. Supports color-screen expansion modules. One adjustable angle for desktop placement. Wall mountable. Handset with hall switch.