Loud wireless doorbell kit (Sevenoaks TN13)

Works well but the fixings for the exterior push-button (doorbell) part, although they hold, have been patched up. 2 interior speakers, one plug-in, the other portable and battery powered. Choice of ring tones. Might be possible to get a replacement doorbell unit but I gave up looking after a very brief search. Otherwise destined for landfill.