The OEM Plantronics Vista M22 headset amplifier is designed for use with traditional or new wideband VoIP phone systems. It includes a 10' coiled cable, allowing you to move away from your phone without removing the headset. This amplifier enhances speech clarity and reduces repeats, errors, and listening fatigue. It is easy to use, featuring a one-button headset/handset selection, and is compatible with most office phones.