Over-the-head style provides optimum comfort and durability.The Plantronics Encore headset delivers the very best in sound quality comfort and reliability for call center and office professionals. Encore sets the standard in premium sound quality with the unique Sound Enhancement System (SES). A tone control switch lets you select the level of bass and treble that you prefer for a full rich sound. Plantronics pays equal attention to fit and all-day wearing comfort.Encore features super-soft ear cushions and a ""click-stop"" adjustment system on the headband and turret that provides exactly the right fit and consistent positioning of the microphone.PRODUCT FEATURES:For offices and call centers where you need sound in both ears to hear more clearly;Voice tube is lightweight unobtrusive and delivers great sound quality;Binaural design brings sound to both ears with convenient singlecord design.