Google Product Search is a still little known (but free) service that lets you submit your own product information so potential buyers can more easily find what you are selling.  The key to successfully listing your products is to provide Google with the right information on your products — that is, the specific “attributes” they are looking for, and not necessarily the way you describe your products on your own website or in marketing materials.

The attributes below come from inside Google itself, so they are a surefire way to improve your results in search listings if you use them right:

1. A good title and description:  This text should accurately reflect the information on your own website. Important Note: Avoid promotional, marketing or sales text such as “Click here now!” or “Free shipping,” even if it appears on your website.
2. Proper product type or category: Be sure to categorize the type of product being offered. You may include multiple product types. The “product type” attribute is critical.  It indicates the category (or categories) of the product being sold. If you already have a system to categorize your items, go ahead and use it. However, Google also provides a standard “taxonomy” (system for categorizing) that you might want to use. If you are starting from scratch or can translate your own categories, the recommended route is to use Google’s system. You’ll find a detailed description of You can find a more detailed description of the product type attributes in the Google Merchant Center help section.  
3. Unique ID: You need a unique identifier for each item you list. You can use any combo of letters and numbers, but this unique ID must not change when you send updates.
4. UPC: The Universal Product Code is a 12 digit number often below the bar code of the item. This is required for all products except for books. (Learn more on UPC and similar codes)
5. MPN: A Manufacturer’s Part Number is a unique code usually assigned to a product by its manufacturer. Most consumer electronics have an MPN. Old attributes such as manufacturer_id or model_number should be dropped. Use the MPN attribute instead.
6. ISBN: This is a unique 10- or 13-digit number assigned to every printed book (required for all books published since 1970). If you have both types of ISBN numbers for a single book, include only the 13-digit number.
7. High quality images: According to Google, including an image greatly increases the chance a user will click on your item in the search results. When adding images to your data feed to Google, make sure to include only high quality images that accurately represent the product as it is displayed on your item page. Do not include logos, generic images or low-quality photos.
8. Condition: The condition of your product is crucial. You might assume that what you sell is all “new,” but others might not. Your basic choices form Google’s point of view are new, used and refurbished. Here’s more on what to include.
9. Brand names:  If your product has a brand name, be sure to include this in the information in supplied to Google.
10. Stay relevant: While it’s good to include as much information as possible, the details you include should always be relevant to what you’re describing. Including irrelevant information or lists of keywords may damage your results.