Core Features: Supports Yealink SIP-T27G/T29G/T46G/T48G/T41S/T42S/T46S/T48S/T52S/T54S/T53 For T48G: upgrade to the version of 35.80.0.95 or higher For T29G/T46G/T46S/T48S: upgrade to the version 81 or higher For T27G/T41S/T42S: upgrade to the version of x.81.0.110 or higher Reliable Connection Ease-of-use Plug and Play High Transmission Rate Lower Power Consumption.