CAMBRIDGE SOUND MANAGEMENT E-P-B-45 Years WarrantyQt? EMITTERSQt? emitters are the backbone of the Qt Quiet Technology Sound Masking System. Qt emitters are wide dispersion direct field speakers with 1.25” (3.17 cm) drivers and are smaller than a coffee mug. All Qt emitters come in the adjustable format. These emitters deliver four uncorrelated audio channels which provide uniform unobtrusive sound masking. This feature along with plug and play installation and easy configuration capability make Qt? systems the most intelligently engineered and most effective sound masking systems on the market today for reducing noise distractions and protecting speech privacy.FeaturesWarranty5 Years