RepricerExpress automatically imports your active products from Amazon for you several times a day. Once they have been imported you are able to set your products to Price Check by adding a Minimum and Maximum Price.
Quite often products will be active for a while on Amazon/Rakuten Play but might end up selling out or you need to stop listing them so they will go inactive. RepricerExpress doesn't delete these listings but marks them as inactive so you don't need to re-enter your Minimum and Maximum price if you get the product back into stock.
You can access a list of your Inactive Products by selecting 'Inactive' from the My Inventory Screen Filters.