PRESENCE™ Grey UC is for the mobile professionals, who require a consistently excellent communication solution. Optimized for Unified Communications and certified for Skype for Business. (Including carry case and USB dongle) Superior audio performance - anywhere, anytime With best in class microphones and noise filtering technologies, PRESENCE™ ensures a clear communication experience also for your listener. Three digital microphones work seamlessly together with Sennheiser's advanced Own-Voice-Detector, SpeakFocus™ and WindSafe™ technologies to ensure crystal clear audio wherever. Multi-connectivity Switch as you please. Seamlessly switch between softphone and mobile calls, effectively combining your in-office headset and your mobile headset. Extended talk time Straight talk - all day. Up to 10 hours' talk time between charges, for a full day's performance on the move. Increased comfort PRESENCE™ offers a flexible choice of wearing styles for mobile professionals on the go all day. Choose between padded ear hook and 4 ear sleeve sizes. Additional headband available as an accessory. All wearing styles are for left or right ear wearing. Voice controlled Tap into Siri and Google Assistant and be online with a touch of a button. Be heard SpeakFocus™ technology zooms in on the user's voice, works in all sound environments and adapts intelligently whatever the environment - for instance in the car, in the office, at a seminar or at the airport. Answer and end calls simply Intuitive on/off function with sliding microphone boom arm, means you are always in control of your calls. Experience WindSafe™ technology WindSafe™ technology reduces wind noise to ensure the clearest possible sound is sent to your listener - and that your answers aren't left blowing in the wind.