Sennheiser Impact D-10 USB ML Single-Side Wireless DECT USB HeadsetPremium, single sided, wireless DECT headset that connects to PC softphone for office professionals using Unified Communications. Get clear, natural sound, all day comfort and the flexibility to move around your office freely. For modern office professionals excellent call quality, even when moving around the office is essential. The IMPACT D Series significantly extends your wireless range so that you can fully engage in conversations and experience