Inventory Synchronization – updates and synchronizes eBay Listings according to Synchronization Policies' rules.

If catalog updates in your Magento are performed using import/export tools, custom scripts, or direct changes in the database, then check the article on how to use Programmatic Possibilities or Track Direct Database Changes functionality to detect changes in products' price and quantity.

Specify according to value Yes/No to Enable/Disable Inventory Synchronization.

Then press Save to apply the settings you provided.