We just took this model down to put up new smoke detectors and was wondering when this was made because it looks very old. It says it contains radioactive material---americium 241 and 2 microcuries. and takes a 9V battery.

Asked by bonniehugsandkissescook on 12/20/2008 1  Answer

ManualsOnline posted an answer 15 years, 4 months ago

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0 The GE Home Sentry smoke alarms started with the square models in the early 70's. Then they changed to the rectangular version like yours in the late 70's.
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