Poly MDA524 QD USB-A Headset Switch Processor

The Poly 8L544AA is the MDA524 QD USB A Headset Switch Processor, a straightforward way to manage calls from both a desk phone and a computer without changing headsets. By placing this small controller on your desk, you gain a single point of control that lets you answer, end, mute, or adjust volume for any call, no matter which device rings.

Inside the switch is a smart audio processor that keeps speech clear. It actively removes background noise, suppresses echo, balances volume, and guards against sudden loud sounds. Whether you work in an open office, a busy contact center, or a home workspace with occasional ambient noise, the result is a conversation that stays focused on the voices that matter.

Connectivity is simple. A built-in USB A cable links to your computer, while the standard four-pin Quick Disconnect port accepts most professional headsets, including the Poly EncorePro 500 and 700 series. If you still rely on a traditional desk phone for certain calls or training scenarios, the switch can connect to it at the same time, letting you move between platforms at the press of a button.

The compact footprint keeps your workspace uncluttered, and the lightweight housing is easy to reposition whenever you rearrange your desk. Because the device carries a two-year limited warranty, you can deploy it across a team with confidence that it will perform day after day.

Customer service representatives, technical support staff, and hybrid workers who split their time between softphones and legacy desk phones will appreciate how the MDA524 reduces cable swaps and unnecessary downtime. It is a small addition to the desk that brings noticeable improvements to call flow and audio quality.

Highlights:

• Height of 1.3 inches, width of 3.3 inches, depth of 4.6 inches
• Weight of 4.94 ounces for easy placement
• USB A connection for plug and play integration with a computer
• Switches between a traditional desk phone and a PC softphone
• Compatible with Poly EncorePro 500 and 700 USB headsets
• Supports standard four-pin Quick Disconnect headsets
• Built-in noise and echo cancellation for clear conversations
• Dedicated buttons for call answer, end, mute, and volume
• Advanced safeguards such as Noise at Work, G616 support, anti-startle protection, and transmit noise suppression
• Two-year limited manufacturer warranty