A basic, ad-supported service is free; the upgraded version, with no ads and higher-quality audio, is $36 a year.

有广告的基本服务是免费的，升级后的版本没有广告，而且有更高质量的声音效果，三十六美元一年。

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At the same time, the shift from PC-based display ads to mobile audio ads is driving down the blended CPM.

FORBES: Connect

Banners (often hidden behind at-work listeners' spreadsheets and documents) back up audio ads with, for example, telephone numbers or links to the advertisers' sites.

ECONOMIST: How well is net radio fulfilling its early promise?

Pandora currently serves about 8 to 12 ads per hour which can consist of 7- to 8 interaction-based display ads and 3 to 4 audio ads.

FORBES: Taking A Closer Look At Pandora's Monetization Strategy