Kidde i9030 User Manual page 16

11. CAUTION (AS REQUIRED BY THE CALIFORNIA
STATE FIRE MARSHAL)
Ionization type smoke alarms use a very small amount of a radioac-
tive element in the sensing chamber to enable detection of visible
and invisible combustion products. The radioactive element is safely
contained in the chamber and requires no adjustments or mainte-
nance. This smoke alarm meets or exceeds all government stan-
dards. It is manufactured and distributed under license from the U.S.
Nuclear Regulatory Commission.