The SIP-T44U IP phone is a feature-rich business tool for excellent communications and extended functionality. Integrated with Hall Switch, T44U gives you a quieter operation and environment. It is a 12-line IP phone that comes with a 2.8-inch color display with backlight and the EXP43 support. United Yealink Optima HD Voice technology, the T44U awards you the superb audio quality and crystal-clear voice communications. The phone feels quicker and more responsive when performing call features. Moreover, the T44U puts dual USB ports in a phone that makes  Bluetooth, Wi-Fi, USB headset and USB recording come true, and you can use any two of them freely according to your needs.2.8” 320×240-pixel color LCD with backlightDual USB portDual firmware imagesT4U Auto-P template unifiedT4U firmware unifiedUp to 12 SIP accountsPoE supportUSB headset and EHS supportWi-Fi via WF40/WF50Bluetooth via BT40/BT41/BT51Supports color-screen expansion modulesStand with 2 adjustable anglesWall mountableHandset with hall switch