Door bell (Mickleover DE3)

Tecknet door bell model WA658, white, as new.
This bell works fine but it started ringing when no-one was at the door. My son says the most likely problem was that someone nearby had the same model of bell, which would have been on the same frequency. I know nothing! But I believed him! So I’ve got another new bell and offering the Tecknet to anyone who wants to give it a go!