Designed for busy executives and professional, the SIP-T46U IP phone is an ultimate communication tool with exceptional performance. The phone employs an appealing high-resolution TFT color display that looks bright and vibrant. HD Voice technology awards you with superb audio quality and crystal-clear voice communications. Dual USB ports make Bluetooth, Wi-Fi, and USB headset, and you can use any two of them freely according to your needs. The Yealink T4U series offers the same elegant appearance as the T4 line, but with greater interoperability and better collaboration improvements.