YealiSIP-T31W; Classical IP Phone;•2.3″ 132×64-pixel graphical LCD with backlight;•Build-in Wi-Fi ;•Yealink HD Voice;Up to 2 SIP accounts;Opus codec support;Headset support;T3 firmware unified;Two-port 10/100M Ethernet Switch ;Wall mountable ;PoE support;Stand with 2 adjustable angles