With this extension you can set In Stock Status for your products.
By default, OC displays Availability : In stock for all products with stock quantity greater than 0. With this extension you can change availability for these products. For example, if you have 100 TV sets in stock, but you can deliver them in 3-4 days, you can set a new Stock Status called '3-4 days' and selected in In Stock Status. You availability will became for those products Availability: 3-4 days. If you won't select anything in 'In Stock Status' select, the default 'In Stock' availability will be displayed.