About twenty advertisers are taking part in a new beta test of Google Audio Ads, ClickZ writes.
The advertisers are uploading 30-second radio ads, in MP3 format, which will air on around 700 radio stations.
 
Google Audio Ads are sold on a CPM basis through the AdWords platform, and advertisers can target on factors like geographical market and time of day

Donna Bogatin has screenshots from Google that show how it plans to serve Google Audio Ads.
Here’s one…

See them all.
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