The DA40 and DA45 adapters work with all Plantronics H-series headsets-including the latest wideband models-to deliver outstanding audio quality, reliability and a choice of wearing styles. The DA40 adapter is the most economical enterprise- class solution available, while the DA45 delivers superior sound with one touch controls.Cost savings, portability, a range of new providers and call features has made PC telephony the ideal tool for phone-intensive organizations. Plantronics delivers a four-model series of usb-to-headset adapters to help contact centers and other businesses derive maximum value from their VoiP investments. Paired with a Plantronics professional headset, our adapters infuse digital-signal clarity into every VoiP softphone communication. a variety of features and pricing options ensure the right fit for all professional environments.