I bought this off of eBay, way back around 1999/2000 from a old retired Master Chief who, at the time, had a business selling salvage from a ship scrapyard in TX. I believe he said it was a engine room alarm. It makes a VERY loud buzzing noise. I know it works, as I connected electricity to it once, many years ago. I've never had a use for it though. It has remained in a storage locker of mine ever since. NC
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