If you have an older model American Sensors smoke or CO detector that is beeping, or more than 5 years old (Carbon Monoxide or combo) or 10 years old (Smoke Only), see below for replacements:
The American Sensors COS2010, SA360 and SA379 detectors have been incredibly popular models installed by builders for years. However they have been discontinued and if you're on this page you probably have a SA360 or COS2010 that has failed, is beeping or similar.
These are the OFFICIAL replacements:
SA360. 670L, 330L is replaced by the BRK 9120A (see it here)
COS2010 is replaced by the BRK SC9120BA (see it here)
SA379, 670LBX is replaced by the BRK 9120BA (see it here)
These new models are cross listed and fully compatible (click to see document) when used with existing American Sensors installations, and they can be interconnected with them so when one goes off they will all sound just like your old SA360, SA379 or COS2010 did.
The new models ship with new brackets (replace by removing 2 screws), and new wiring harnesses (replace by unscrewing the wiring connectors and replacing with the new harness while observing wiring colours. You will need to install the new mounting bracket and wiring harness provided with the new detectors. It's not hard but if you are not comfortable please get help.
As a side note, if you're replacing your old smoke and CO detectors it's most likely that ALL of your smoke and CO detectors are old and no longer effective, so they should ALL be replaced at the same time. Your life is worth a lot more than the cost of the detectors and you'll save on shipping if you buy multiple units.