The Yealink T42U IP phone enables top-quality communication with exceptional audio and crystal-clear voice quality. Business SIP phone with an elegant design Backlit 192 x 64 LCD Yealink Optima HD audio quality 2 x Gigabit LAN ports PoE support (Power over Ethernet, IEEE 802.3af, class 2) Phone book for up to 1000 entries Up to 12 SIP accounts EHS support Note: Power supply available separately