The Plantronics Headset – BackBeat Pro 2 has on-demand active noise cancelling that creates an oasis of personal space in a public place with one touch. To hear announcements and conversations around you, simply activate open-listening mode. When you remove your headphones, smart sensors pause your music automatically, then resume when you put them back on. From music to movies, BackBeat PRO 2 pulls you in with the richness and definition of Plantronics signature audio quality. High notes sound crisp, mid-tones sound natural, and deep powerful bass delivers low notes with minimum distortion. with on demand noise cancelling silence the world at the touch of a button. The BackBeat PRO 2 can stream audio up to 100 meters/330 feet from your Class 1 Bluetooth device. Enjoy enough listening time to take you through your longest workdays or red eye flights with up to 24 hours of music, movies, and calls on a single charge. Plus, you can connect to two devices at once and easily switch as needed from concentration to conversation.