What is the speaker or fan looking item on a telephone pole?

or:What is the speaker or fan looking item on a telephone pole?or:See if you can find a picture of it here: www.google.com/search?site=&tbm=isch&sour

or:What is the speaker or fan looking item on a telephone pole?

or:See if you can find a picture of it here: www.google.com/search?site=&tbm=isch&source=hp&biw=1024&bih=739&q=telephone+polePost the link to the page containing the pic.

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