1997 Carbon Monoxide detector that saved lives during derecho

Some idiots installed a generac under the soffits, which caused carbon monoxide inside the home and set off this 1997 detector (miracle) installed at my grandparents’. Saved my mom and grandparent’s lives the night of derecho. Later, it fell down and broke when Beryl caused a tree to fall on roof. Just ordered 3 new ones on Amazon