• Supports Yealink SIP-T41S/T42S/T46S/T48S/T52S/T54S/T56A/T58A/T58V • For T41S/T42S/T46S/T48S/T52S/T54S: upgrade to the version 82 or higher • For T56A/T58A/T58V: upgrade to the version 80 or higher • USB and 3.5mm connectivity to laptop and smart device • Simple call management via control unit • Integrated LED indicator and warning tone • ActiveProtection technology safeguards users from acoustic injury • HD Voice/Wideband speaker performance and noise cancellation • 330° bendable boom arm for easy adjustment without breaking