The Atwood Propane Gas detector in our RV has reached its 84 months EOL. I know this because it's flashing its orange light, and beeping every minute or so. Neither of these behaviors is stopped by the Mute / Test button. The only way to stop the noise is to kill power to it, living us completely unprotected until a replacement arrives.
Do product designers not think of these things? What if that had started in the middle of the night? Was EOL really 84 months ±1 minute?!