Carbon monoxide detectors

pixer12

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Mar 17, 2012
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Arrived from the US a few months ago and I am interested in getting one of these for my new place. Found a few on Mercado Libre which seem to be much cheaper than the one I looked at tonight at Easy Palermo. Here's an example. Why would this type be so cheap? Why would the other type (also available on ML here) be so expensive? (And why are these not more widespread here?)
 
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