WHAT TYPE OF SMOKE ALARMS ARE REQUIRED ?:s.sdcpm.com/smoketype

A: All new alarms installed must have 10-year minimum battery life, include a quieting feature, have the display date of manufacture and installation, include End of life feature to notify when need to be replaced. A hush feature.
The battery must be non-replaceable and non-removable

B: It is not necessary to replace existing alarms if they work ok.