Jabra EVOLVE 40 MS Stereo Headset is a headband-style headset comes with a control unit for easy operation as it allows you use the functions like volume and mute and the ability to end and answer calls. This control unit is connected to your Jabra EVOLVE 40 MS Stereo Headset using a 3.5mm headphone jack which allows you to connect the headset to your devices such as smartphone and tablet. It is also optimized for Microsoft Lync that provides plug and play installation for your headset wherein it connects to your system via the USB cable on the control unit.