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S1209 Series - Gentex

• The S1209 Series alarm shall have a Duracell® MN 1604 9V alkaline battery as a back-up in the event building power is lost. • The 9V battery impedance shall be verified by the circuit of the smoke alarm. • The alarm shall provide an indicator when the battery is low in power, high impedance or is missing.

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  Series, Duracell, 1920s, S1209 series

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