"New Cameras for Landing
For the Mars 2020 Perseverance rover, the engineering team added several cameras and a microphone to document entry, descent and landing in even greater detail. The cameras capture full-color video throughout the vehicle’s final descent to the Martian surface. Some of what the cameras see on the way down will help mission planners decide on the rover's first drives.
These new eyes and ears of Perseverance are assembled from easily available commercial hardware.The cameras and microphone are being flown as a "discretionary payload," which means it's an optional add-on that will be an asset, but is not required for the mission"