Plantronics 2.5mm Plug HandsFree Sound-Isolating Cell/Mobile Phone Headset/Headphone/Earphones Take calls and listen to tunes anytime, anywhere! Effortlessly switch between calls and tunes. Outstanding stereo sound performance for music or video with reduced background noise. Wear in stereo (to immerse yourself in music) or mono (to listen to tunes and hear others) Inline microphone with convenient one-touch call answer/end button for easy access Three sound-isolating ear tip sizes for a perfect, comfortable fit, and fewer noise distractions