Thanks to a headset, you don't have to hold the handset permanently in your hand. Avoid painful cramps in the arm and shoulder area and get your hands back.As an optional extension, a Bluetooth headset can be used on the COMfortel D-400 via the COMfortel D-Stick EZC-5200BS. Easily connect your personal Bluetooth headset to have more mobility and both hands free while working.Need even more range? The COMfortel H-500 gives you the necessary freedom to move further away from your desk.