BOSCH 10W Weatherproof PA Horn Speaker 100V line, brand new in box.  Made of ABS, impact resistant. 

https://resources-boschsecurity-cdn.azureedge.net/public/documents/Operation_Manual_enUS_1213619211.pdf

These guys are selling it for £91 + VAT, which is £119.20.

https://blaydoncomms.co.uk/product/loudspeakers/horn-speakers/bosch-lbc-3491-12-re-entrant-horn-loudspeaker/