Style:SD Office ML With the SD Office ML, you get everything you need in an office headset, wrapped in one unique headset. The SD Office is a single-sided premium wireless DECT headset for desk phone and PC/softphone with base station. It features Sennheiser Voice Clarity, a noise-cancelling microphone, ActiveGard Technology, and a choice of various wearing styles. Choosing the right SD Office: SD OFFICE This headset is designed for business professionals who communicate with their desk phone and softphone. SD OFFICE ML This headset is designed for business professionals who communicate with their desk phone and Skype for Business When business demands the best performance. The SD Series represents the ultimate in quality sound and performance. Combine this with outstanding design and an extremely high level of craftsmanship and you have the perfect wireless headset solution for all your business needs..