Specification attributes is simillar to product attributes, the only difference is, specification is used to present additional information about the product.
Like mentioned at product attribues, attribute may be added at the Catalog >> Specification attributes. Adding values may be at this place, or at the product specificaion attribute tab.
Open Catalog >> Specification attributes location and click add new button
Add name and other files if require.
Will add options which will be available for each product at the store.
My sample product, a game, will be able to be offered only for PC. So would like to add such a information to it.
Will need to open product datails page, and open specification attributes tab
When click Add button and will save my product, it will be shown on the public store as below