The sip-t46s ip phone is the ultimate communications tool for busy executives and professionals. In addition to offering better overall performance than the t46g, this device has a faster interface with a rich, high-resolution tft color display. Built with Yealink optima hd technology and wideband codec of opus, this device enables crystal clear communications. The sip-t46s is also built with gigabit Ethernet technology, for rapid call handling and use with accessories like a Bluetooth usb dongle and a Wi-Fi usb dongle. The new t4s series offers the same elegant appearance of the t4 line, but with improvements for greater interoperability and collaboration. Upgrades from sip-t46g.