Not sure exactly what it is and hasn’t got any instructions. It has a telephone socket connector wire.
Which suggests it is a loud alarm for when the phone rings possibly. For If you are in a noisy workshop and need to hear the phone?
But I guess if you know then you know.
Possibly this one… https://www.hbl.co.uk/our-products/telecoms/bedlam-loud-tonecaller/
Tonecaller alarm? (Newhaven BN9)
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