Especially designed for busy executives and professionals, Yealink SIP-T57W is an easy-to-use Prime Business Phone with an adjustable 7-inch multi-point touch screen that you can not only easily and flexibly find the comfortable viewing angle according to the personal and environmental needs, but also get a rich visual presentation and easy navigation with just one-touch. 2 x Ethernet ports 10/100/1000, PoE support, Built-in Bluetooth 4.0, Built-in Dual Band Wi-Fi (2.4GHz & 5Ghz 802.11ac) Opus codec support, Built-in USB 2.0.