The Yealink UH34 over-the-head headset is a professional, wired and binaural headset with crystal clear audio quality. Foam ear pads. Version with USB connectivity, with extra light material and leather ear pads, the total headset cable length is approx. 2.1 m and a call control unit is integrated. Note: Please update the IP phones SIP-T41S, SIP-T42S, SIP-T46S and SIP-T48S to firmware version 82 or higher!