Crystal-clear conversation Poly DA Series digital adapters keep call center employees sounding crystal-clear from home or in the office. With easy USB-A or USB Type-CᎯ connections, they adjust audio to each specific Poly headset, offering quality calls [1]. * Preserve your tech investment with the Poly DA Series. Not only do these digital adapters include USB-A and USB Type-CᎯ access right on the cable, they’re also compatible with all your new and legacy Poly headsets and accessories [2]. * Call clarity isnt just a dream. Poly DA Series offers intelligent headset recognition that dynamically tunes audio performance. Stay distraction free to maximize productivity.