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Walmart has the First Alert Smoke Alarm/Carbon Monoxide Alarm Combo (SCO403-3) for $16 + $1 shipping = $17 shipped. Includes battery-operated CO detector with electrochemical sensor, 85-decibel smoke detector and 5-year limited warranty.

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    awestun Ben's cred: 158
    Posted 1:33 am PDT 09/12/12

    most people dont know , but carbon monoxide detectors have expiration dates. most likely smoke alarms do too.

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    suednim Ben's cred: 133
    Posted 8:21 am PDT 09/12/12

    CO alarms expire ~ 5-7 yrs.

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    zzyzx Ben's cred: 82
    Posted 8:42 am PDT 09/12/12

    Smoke alarms ~10 years. See manufacturer's instructions...

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    Ben's Price
    • First Alert Smoke Alarm/Carbon Monoxide Alarm Combo $19 at Lowe's
    • $19
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