Skip to main content
Share:

Kidde Battery Operated Wireless Interconnect Combination Carbon Monoxide, Fire & Smoke Alarm
KN-COSM-B-RF


Provides protection from two hazards – fire and CO – Interconnects without wires, when one alarm sounds they all do.
Power Source
Battery
Safety Features
Best
MSRP*
$$$

Description

The Kidde KN-COSM-B-RF Combination Smoke & Carbon Monoxide Alarm provides two important safety devices in a single unit. This alarm includes a voice warning system that announces “Fire”, “Warning, Carbon Monoxide”, “Low Battery”, and “Caution, Carbon Monoxide Previously Detected.” The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of replacement. 

This alarm can be installed as a single unit, or in a multiple station configuration that will enable wireless communication with the other alarms in the case of a smoke or CO event. Installation of the interconnect system is quick and easy, and avoids the hassle of extensive wiring and labor. Per NFPA guidelines, the interconnected system should not exceed the limit of 12 smoke alarms, or 24 total devices.


  • Wireless Communication – Offers the safety benefits of an interconnected system without having to run new wiring.
  • Voice Alarm – Announces the hazard type thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installation time and helps to keep home décor attractive.
  • Peak Level Memory – If the alarm has detected a CO level of 100ppm or higher, the unit will announce “Carbon Monoxide Previously Detected” to warn of the CO incident, when the Test/Reset button is pressed.
  • Silent Mode Feature – Temporarily silences nuisance alarms.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • LEDs – Flashing green for normal operation and flashing red for alarm condition.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur.
  • Low Battery Silence – Disable low battery chirp for 10 hours without disconnecting power from alarm
  • Ionization Smoke Alarm Sensor
  • UL Listed

Technical Specifications

Part Number: 900-0225
Model: KN-COSM-B-RF
Power Source: 3AA battery
SmokeSensor: Smoke, Ionization, CO; Electrochemical
CoSensor: Electrochemical
Audio Alarm: 85dB at 10ft
Temperature Range: 40˚F (4.4˚C) to 100˚F (37.8˚C)
Humidity Range: 10%-85% relative humidity, non-condensing
Size: 6" L x 6" W x 1.75" D
Weight: 1.75lb
Interconnects: Up to 24 devices (of which 12 can be smoke alarms)
Warranty: 10 year limited

Architectural and Engineering Specifications

The combination smoke and carbon monoxide alarm shall be Kidde Model Number KN-COSM-B-RF (Part number 900-0225) or approved equal. It shall be powered by three (3) AA batteries. The unit shall incorporate an ionization sensor with nominal sensitivity of 0.89%/ft +/- 0.19%ft. The CO sensor shall be of a fuel cell design and provide accuracy of +/- 20% + 15ppm. The temperature operating range shall be between 40°F and 100°F (4°C and 38°C) and the humidity operating range shall be 10% to 85% relative humidity, non-condensing. The combination alarm can be installed on the surface of any wall or ceiling following the UL/NFPA/Manufacturer’s recommended placement guidelines. The alarm shall include a test button that will electronically simulate the presence of smoke and CO and cause the unit to go into both modes of alarm. This sequence tests the unit’s electronics to ensure proper operation. The combination alarm shall have two methods of warning for danger: a piezoelectric horn that is rated at 85 decibels at 10 feet and a voice warning that identifies the danger. For a CO incident, the horn will sound in the repetitive manner – four (4) fast beeps, a short pause, four (4) fast beeps, a short pause. In between, the unit will announce “Warning Carbon Monoxide!” In a smoke incident, the horn will sound in the repetitive manner – three (3) beeps, a pause, three (3) beeps, a pause. In between, the unit will announce “Fire!” The smoke alarm takes precedence when both smoke and CO are present. The CO sensor will not alarm to levels of CO below 30 ppm and will alarm in the following time range when exposed to the corresponding levels of CO. 70 ppm CO Concentration 60 – 240 minutes 150 ppm CO Concentration 10 – 50 minutes 400 ppm CO Concentration 4 – 15 minutes. The unit shall also indicate a low battery warning utilizing each of the following methods: a brief alarm chirp, the voice announcement of “Low Battery!” and the red LED will flash once per minute. The unit shall incorporate two LEDs. A green LED will flash every 60 seconds in standby condition. A red LED will flash during smoke or CO alarm, and in error mode. The unit shall at a minimum meet the requirements of UL2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshal, NFPA 101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 10-year manufacturer’s limited warranty.

Description

The Kidde KN-COSM-B-RF Combination Smoke & Carbon Monoxide Alarm provides two important safety devices in a single unit. This alarm includes a voice warning system that announces “Fire”, “Warning, Carbon Monoxide”, “Low Battery”, and “Caution, Carbon Monoxide Previously Detected.” The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of replacement. 

This alarm can be installed as a single unit, or in a multiple station configuration that will enable wireless communication with the other alarms in the case of a smoke or CO event. Installation of the interconnect system is quick and easy, and avoids the hassle of extensive wiring and labor. Per NFPA guidelines, the interconnected system should not exceed the limit of 12 smoke alarms, or 24 total devices.


  • Wireless Communication – Offers the safety benefits of an interconnected system without having to run new wiring.
  • Voice Alarm – Announces the hazard type thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installation time and helps to keep home décor attractive.
  • Peak Level Memory – If the alarm has detected a CO level of 100ppm or higher, the unit will announce “Carbon Monoxide Previously Detected” to warn of the CO incident, when the Test/Reset button is pressed.
  • Silent Mode Feature – Temporarily silences nuisance alarms.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • LEDs – Flashing green for normal operation and flashing red for alarm condition.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur.
  • Low Battery Silence – Disable low battery chirp for 10 hours without disconnecting power from alarm
  • Ionization Smoke Alarm Sensor
  • UL Listed

Technical Specifications

Part Number: 900-0225
Model: KN-COSM-B-RF
Power Source: 3AA battery
SmokeSensor: Smoke, Ionization, CO; Electrochemical
CoSensor: Electrochemical
Audio Alarm: 85dB at 10ft
Temperature Range: 40˚F (4.4˚C) to 100˚F (37.8˚C)
Humidity Range: 10%-85% relative humidity, non-condensing
Size: 6" L x 6" W x 1.75" D
Weight: 1.75lb
Interconnects: Up to 24 devices (of which 12 can be smoke alarms)
Warranty: 10 year limited

Architectural and Engineering Specifications

The combination smoke and carbon monoxide alarm shall be Kidde Model Number KN-COSM-B-RF (Part number 900-0225) or approved equal. It shall be powered by three (3) AA batteries. The unit shall incorporate an ionization sensor with nominal sensitivity of 0.89%/ft +/- 0.19%ft. The CO sensor shall be of a fuel cell design and provide accuracy of +/- 20% + 15ppm. The temperature operating range shall be between 40°F and 100°F (4°C and 38°C) and the humidity operating range shall be 10% to 85% relative humidity, non-condensing. The combination alarm can be installed on the surface of any wall or ceiling following the UL/NFPA/Manufacturer’s recommended placement guidelines. The alarm shall include a test button that will electronically simulate the presence of smoke and CO and cause the unit to go into both modes of alarm. This sequence tests the unit’s electronics to ensure proper operation. The combination alarm shall have two methods of warning for danger: a piezoelectric horn that is rated at 85 decibels at 10 feet and a voice warning that identifies the danger. For a CO incident, the horn will sound in the repetitive manner – four (4) fast beeps, a short pause, four (4) fast beeps, a short pause. In between, the unit will announce “Warning Carbon Monoxide!” In a smoke incident, the horn will sound in the repetitive manner – three (3) beeps, a pause, three (3) beeps, a pause. In between, the unit will announce “Fire!” The smoke alarm takes precedence when both smoke and CO are present. The CO sensor will not alarm to levels of CO below 30 ppm and will alarm in the following time range when exposed to the corresponding levels of CO. 70 ppm CO Concentration 60 – 240 minutes 150 ppm CO Concentration 10 – 50 minutes 400 ppm CO Concentration 4 – 15 minutes. The unit shall also indicate a low battery warning utilizing each of the following methods: a brief alarm chirp, the voice announcement of “Low Battery!” and the red LED will flash once per minute. The unit shall incorporate two LEDs. A green LED will flash every 60 seconds in standby condition. A red LED will flash during smoke or CO alarm, and in error mode. The unit shall at a minimum meet the requirements of UL2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshal, NFPA 101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 10-year manufacturer’s limited warranty.

FIRE SAFETY MADE SIMPLE.
CUT THE BATTERY CHIRPING – AND $40 IN BATTERY COSTS.
IF YOU HAVE QUESTIONS, FIRE AWAY.
Similar Products
Smart_Assistance_165
Compatible with smart products
Compatible with Google Assistant and Alexa. Use voice commands to
check alarm status and connection.

Google Assistant is a registered trademark of Google LLC. Amazon, Alexa and all related logos are registered trademarks of Amazon Technologies, Inc.