United Yealink Optima HD Voice technology, the T44W awards you superb audio quality and crystal-clear voice communications. The phone feels quicker and more responsive when performing call features. It has built-in Bluetooth 4.2 and built-in dual-band 2.4G/5G WiFi. The T44W offers the same elegant appearance as the T4 line but with improvements for greater interoperability and better collaboration. It is compatible with more Yealink headsets, supporting intelligent channel switching* and using the phone to configure and upgrade headsets.