Sennheiser Enterprise Solution 615104053601 CC 540 VOIP Telephone Headset The binaural headset offers powerful, precise sound to both Ears for optimal understanding Its durable construction makes it perfect for any Type of office or Professional communication Activegard safeguards the user from the effects of an acoustic burst Independent, double-sided headband adjustment and self-adjusting ball-mounted speaker capsules allow perfect fitting to the head 300 adjustable Microphone BOOM allows Microphone to be positioned exactly for optimal speech clarity Compatible with major telephone and call center systems Adjustable microphone boom with microphone pivot Replaceable leatherette ring ear pads 80-centimeter cable; adjustable headband 200 Hz to 4.5 kHz frequency response in headphone 100 Hz to 4.5 kHz in microphone Connector: Easy Disconnect (ED)