I was replacing an old unit in our RV and wanted to stay with the same company that made the original unit. I think it will be fine as the test alarm functions appropriately. I do think it is older than I would have liked. It says to replace by a certain year but there is no year on the box or unit. The battery was dead and that kind of gives it away. I wrote the replacement date on the unit. I received the unit quickly and it was easy to install.