Digital Amplifier with Phone Headset Why Do I Need A Headset Amp? Desk Phones sound quality of those built-in components vary greatly from device to device, some sound terrible, some are decent.DAC (digital-to-analog converter) converts Phone Analog audio into Digital audio signal to sound their very best.Able to increase Microphone Volume to customers (Any Desk Phones only control speaker volume)Able to train an employee' chat or connect a recorder DURABLE Professional Headset SAME DAY response for ANY inquiries How to connect the included Headset Package includes a Headset and a Quick Disconnect Cord with an AmplifierPowered by an included USB cordNOT include Supervisor Headset, Recorder, RJ9 adapter cable Connect to a Desk Phone Headset Port Connect to the Desk Phone Headset Port if it iswith included Telephone cord Connect to a Desk Phone Handset Connect with Desk Phone Handsetwith included Telephone cord Digital Headset Amplifier Package Compatible with 99% Desk Phones and Avaya MLS-6, MLS-12, MLS-12D, MLS-18D, MLS-34 MLS-34D, T7316, T7316eCisco 7902G, 7905G, 7906G, 7910G, 7911G, 7912G, DX650 [DIGITAL Amplifier Features] Digital Volume Control for Mic and Speaker with a Supervision port monitoring and connecting recorder.Universal Phone compatibility switch makes most telephones compatible USB Powered [Quick Disconnect Headset Features] Professional Headset for telephone intensive environments. Outstanding Convenience with Quick Disconnect cord when you move away from your Desk Phone.With your office phone system, Static shock protecting Noise Cancelling Mic delivers reduced background noise in a noisy office while enjoying additional productivity keeping both hands free. Easily Stay-put click-stop headband for a custom-fit, superior durability headset offers a cost-effective solution to call center, Office, Home Agent, Telemarket. Soft Rubber T-bar supports all-day long comfortable wearing.