Plantronics legendary cs family is setting a new wireless standard with the cs500 series the cs540 features a new headset design streamlined base and improved performance all with the same dependability for wireless productivity that has made the cs series a best seller the cs540 features the lightest headset in the industry weighting only 21 grams gives you up to 350 feet of range to roam your office and a battery made to last all day giving you 7 hours of talk time superior comfort