If you have a builder installed smoke or combination smoke and carbon monoxide detector, there’s a good chance it’s an American Sensors model. If it’s a smoke and carbon monoxide detector it is likely a model COS2010.
If your smoke detector is over 10 years old or your combination smoke/co detector is over 5 years old, or they start to beep, they are due to be replaced. You really should replace ALL of the detectors at the same time
The good news is that we still have replacements available for most of the common models. For much older models you can check out our American Sensors replacement cross reference.
Stay safe and replace your old detectors for safety!