• Kidde Carbon Monoxide Alarm - Basic Protection - KN-COB-IC - 900-0120 - 21006406

    - Hard Wired - 9 V Battery Back up - Electrochemical Technology - 120V AC/DC

    Product ID • 900012000000

  • $30.75
  • Quantity:
  • Free Shipping Eligible


The Kidde KN-COB-IC 900-0120 is an AC wire-in Carbon Monoxide alarm that warns you and your family of dangerous carbon monoxide levels. It includes multiple contractor friendly features to ensure easy installation and minimal troubleshooting. The Kidde KN-COB-IC 900-012 alarm interconnects with up to 24 Kidde alarms and devices (of which 18 can be initiation) including smoke alarms, CO alarms and heat alarms on one wiring network. The KN-COB-IC includes a 9volt battery backup along with a 5 year limited warranty.

Please Note: The Kidde KN-COB-IC (900-0120) replaces Firex 10000, Firex 6035 and Firex 6040.

Need to replace old Firex alarm?

Please Note: Unless you are replacing Firex FADC, ADC, and AD, you are REQUIRED to replace ALL your old Firex alarms with this KN-COB-IC unit. Otherwise, your old Firex units will NOT be able to communicate with this KN-COB-IC unit. This Kidde KN-COB-IC model can replace the old CO & smoke Firex model:

Firex 10000 -  Firex 6035 - Firex 6040

Since old Firex and new replacement have different wiring harness, the existing wiring harness needs to be changed.

If you don't want to rewire, you need to get a quick convert adapter Kidde KA-F and perform 3-easy-step installation:
1.Replace the ceiling mounting bracket
2.Install KA-F adapter and attach existing wiring to the alarm.
3.The new alarm will now be interconnected and compatible with your Firex alarm system.

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Manuals & Docs

Technical Specs

Kidde Carbon Monoxide Alarm KN-COB-IC - 900-0120 21006406 Techs and Specs

  • Model
  • Power Source
    120 Volts
  • Sensor
  • Audio Alarm
    85dB at 10 Feet
  • Battery Backup
    9 Volts Battery
  • Temperature Range
    40 Degrees F to 100 Degrees F
  • Size
    5.75 Inch diameter x 1.8 Inch depth
  • Humidity Range
    5% to 95% relative humidity (RH)
  • Weight
    1 Pound
  • Interconnects
    Up to 24 Kidde Devices
  • LED Green
    Receiving ACV power
  • LED Red
    Alarm mode
  • Warranty
    10 year limited

Kidde Carbon Monoxide Alarm KN-COB-IC - 900-0120 21006406 Features

  • Battery Pull Tab Eliminates battery installation time and keeps battery fresh
  • Adjustable Mounting Bracket Allows for fast installation and perfect alignment
  • Quick Connect Installs quickly with snap-on harness
  • Sealed Cover Reduces nuisance alarms. Sealed to protect sensor from contaminants prior to installation
  • Tamper Resist Locking Feature To deter battery and alarm theft
  • Alkaline Battery Backup for continuous protection in case of power failure