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
I may do that, I have a portable one that allow me to move every couple years until now.
@edscoble started
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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