– 900MHz wireless technology
– Hands-free up to 350 feet
– Extraordinary sound quality
– An adaptive power system optimizes for range and talk time by automatically downshifting to low power when the headset is close to the base to save battery life
– Audio controls for volume/mute at your fingertips
– Conference in up to three additional CS500 series
– Use with electronic hookswitch cable or handset lifter to remotely answer/end calls
– Noise-cancelling microphone
– ***the main difference between the CS540XD and the CS540 is that the XD version was designed to address wireless density issues, so that more wireless headsets can be used in the same space while maintaining clear conversations.***