When you list your item, be sure to respond completely when the Sell Your Item form asks for product data (Pre-filled Item Information). This information is used in eBay's Product Finder, which many buyers use to find products with exactly the features they want. If you don't include this data, you'll miss out on potential buyers. For many products, eBay can already fill in generic product data for you.

Note: eBay research shows sellers who use pre-filled item information often have better sell-through rates.