The Yealink SIP-T53 is designed to be an easy-to-use, high-quality business phone for executives and business professionals. The adjustable 3.7-inch graphic LCD display allows you to easily and flexibly find a comfortable viewing angle to suit your personal and environmental needs. With Yealink Bluetooth USB dongle BT40 and Yealink Wi-Fi USB dongle WF40/WF50, the SIP-T53 IP phone ensures that you keep up with modern wireless technology and are at the forefront of the future wireless era. The integrated USB 2.0 port enables USB recording or connection to a direct wired/wireless USB headset or up to three Yealink EXP50 expansion modules. This makes the Yealink SIP-T53 a powerful and expandable office phone that offers optimal desktop efficiency and productivity. • 3.7" 360 x 160 pixel graphic LCD with backlight • Adjustable LCD screen • Bluetooth via BT40 • Wi-Fi via WF40/WF50 • USB 2.0 port for USB recording, wired/wireless USB headsets and EXP50 • Up to 12 VoIP accounts • Dual port Gigabit Ethernet connection • PoE support • HAC handset • Paper label-free design • Wall mountable