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My brass button - wireless hack uses the Teknet ones. Two units that plug into mains sockets. Each can be set to flashing light/sound/both.
https://smile.amazon.co.uk/TeckNet-Wireless-Doorbell-Waterproof-Batteries/dp/B071ZJ63N1
Also available in black
Not much point when we move regularly every half decades, plus I can only get flashing alarm with battery/main type.