SIP-T57W - DMSE Yealink Prime Business Phone, 7"" 800*480 pixels adjustable LCD with capacitive touch screen, Built-in Bluetooth 4.2 and dual band 2.4G/5G Wi-Fi, USB 2.0 port for USB recording, wired/wireless USB headsets and EXP50, Up to 16 SIP accounts, Dual-port Gigabit Ethernet, Optimal HD audio, HAC Handset, Paperless label design, Wall mountable, IEEE 802.3af POE support psu without,