Mine were Kidde as well. They were installed by my dad maybe 17 years ago when he built the home. I eventually found the breaker after a fun game of yelling “Is the light on?” I laughed when I found out it was on the same breaker as the septic aerator (which I had apparently also attached to a garage circuit overhead for work lights and ceiling outlets for tools due to the wall circuit overloading). Fun fact for the people who may not be familiar with septic aerators - when they lose power they have a box on a separate circuit for the failure alarm (which isn’t very loud but annoying af), so apparently when my aerator failed and I turned off the alarm until I got a replacement 1 month later, I had also turned off the fire alarms (good thing they have batteries).