Sennheiser Presence Grey UC (508342) - Dual Connectivity, Single-Sided Bluetooth Headset for Mobile Device & Softphone/PC Connection, with Carrying Case and USB Dongle (Black)Presence Grey UC is a premium Bluetooth headset for mobile professionals who demand a consistently excellent communication solution both for themselves and their listeners. Using a 3 digital Microphone system, speak focus and wind safe technologies provide clearer sound to listeners under noisy conditions and deliver best-in-class Sennheiser voice clarity to optimize Speech intelligibility in challenging environments. The slim, lightweight headset represents the ultimate in discretion for everyday business professionals and comes with a protective carry case. Presence Grey UC is optimized for unified Communications and provides multi-connectivity and seamlessly switching between softphone and mobile calls. It offers up to 10 hours’ call time between charges and a flexible choice of wearing styles for mobile professionals on the go All day.Sennheiser CH 20 MB Headset Charger (with stand) for Sennheiser Mobile Business Pro Series and PRESENCE Mobile SeriesSennheiser CH 20 MB, USB charger and stand for MB Pro 1 and MB Pro 2, multiple mounting options: wall mounted, where space is limited.