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Found this while cleaning my house. [SOLVED]
(i.imgur.com)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
It looks to me one of those RF gadgets they hand out at cafes and eateries to let you know when your order is ready to collect.