Plantronics CS540 Convertible Headset: * Range up to 350 feet away for maximum mobility * Versatile cordless headset offers you a choice of four comfort-tested wearing options to match your personal style * Premium wideband audio quality * 1-touch call answer/end, volume, mute and flash controls * Plantronics Convertible Headset features an adaptive power management system that optimizes for range and talk time * Conference in up to three additional CS500 or Savi headsets for enhanced collaboration * Guest headsets can subscribe to a base by simply docking the headset * Use the Plantronics CS540 with the Electronic Hook Switch Cable or Handset Lifter to remotely answer/end calls * Energy efficient adaptive power system * Conference in up to three additional Savi or CS500 headsets * New headsets can subscribe to a base by simply docking the headset * Plantronics CS540 Convertible Headset includes base, headset, headband, other size eartip and earloops, power supply and telephone interface cable