Generally a good manufacturer and device. Just not the ones they sent me! Change every 5 years according to the manufacturer, and this one (see photo) is already 1.5 years old. SO. Upon arrival, 30% of the useful life had already expired. In addition, the packaging didn't look new, or at least was suspicious. The package was stapled together and the cardboard insert was a copied sheet of paper. You can even see the shadow of the original in the copy. There was also a large red spot in the center of the copy. Summary. No new detector and very questionable packaging. I'm glad Revain has an easy return policy as this one is returned. The original manufacturer and the product seem to be highly regarded, but I'm not sure if it comes directly from the manufacturer.
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