Free - Newhaven BN9 - listed on Trash Nothing
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/ https://trashnothing.com/pics/Sy53MX6