Google has announced a new advertising format for Google Merchant Center users. The format is based on the product extensions AdWords format that lets advertisers add specific product listings.

There is a difference with this new format, however. The format, which runs on Google Product Search, will show users products and prices without them having to click on a "plusbox" to expand the ad.

"These ads are a great opportunity to market the breadth of your product catalog and highlight any promotional messages directly to conversion-ready shoppers on Google Product Search," says Google Product Search Product Manager Andrew Poon.

Poon also notes that to take advantage of the new format, you should make sure your product extensions ad campaigns are being served on "search partner" sites.

This isn't the only new ad format from Google. The company also announced a new location extensions format with map features today. More on that here.