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Features
UPC
Brand
MPN
Smoke Sensor
Audio Alarm
Power Source
Interconnects
Warranty
Sensor lifespan
Installation location
Display
Test/silence button
Features
Visual indicators
 
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    First Alert CO615

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    *Est. $35
    Pros: can plug into any outlet, display shows both current and peak CO levels, includes battery backup, cord allows for flexible placement
    Cons: battery door hard to close, button required for display
    (359 reviews)
     
    First Alert CO615
    N/A
    First Alert
    CO615
    N/A
    85 db horn
    120V AC with 2 AA battery backup (included)
    No
    5-year limited
    5 years
    At wall outlet or on nearby table/shelf
    Shows CO level, battery level and peak CO level
    Yes
    Front-access battery compartment, repeats alarm 4 minutes after mute, low battery alert, end-of-life alert (unit needs replacing), power cord for placement further from the outlet
    Green LED for normal operation, flashing red LED for alarm or low battery
     
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    Kidde KN-COPP-B

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    *Est. $35
    Pros: battery powered, placement flexibility, constant digital readout, seven-year sensor lifespan
    Cons: requires battery replacement, slower response time than some models, some functioning issues
    (160 reviews)
     
    Kidde KN-COPP-B
    N/A
    Kidde
    KN-COPP-B
    N/A
    85 db horn
    3 AA batteries
    No
    5 year limited
    7 years
    Attach to wall or set on table/shelf
    Shows CO level
    Yes
    Front access to battery compartment, audible low-battery alert
    Green LED for normal operation, red LED for alarm
     
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    First Alert Onelink SCO5 …

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    *Est. $75
    Pros: interconnects wirelessly, easy to install, photoelectric smoke sensor, voice warning, six-year replacement alert
    Cons: expensive, no digital display, doesn't detect flaming fires
    (94 reviews)
     
    First Alert Onelink SCO5 …
    029054002457
    First Alert
    5369525
    Photoelectric
    85 db horn followed by voice alert identifying the danger as CO or smoke and the location (e.g., "basement" is one of the 11 pre-programmed choices)
    2 AA batteries (included)
    Wirelessly up to 16 alarms
    5-year limited
    6 years
    Attach to ceiling or wall
    N/A
    Yes (also press this button to hear peak CO level)
    Internal timer and end-of-life alert when unit needs replacing, side access drawer to battery compartment
    Flashing green LED for normal operation or battery low, flashing red LED for alarm or silenced
     
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    Kidde KN-COSM-B

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    *Est. $35
    Pros: inexpensive, easy to install, combination smoke and CO detector, voice warning, seven-year sensor lifespan
    Cons: no display, doesn't detect smoky fires
    (446 reviews)
     
    Kidde KN-COSM-B
    N/A
    Kidde
    KNCOSMB
    Ionization
    85 db horn and voice alert
    3 AA batteries
    No
    5-year limited
    7 years
    Attach to ceiling or wall
    N/A
    Yes
    Announces "low battery" and chirps when the battery needs replacing
    Flashing green LED for normal operation, flashing red LED for alarm or low battery
     

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