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Kidde AC Hardwired Combination Photoelectric Smoke & CO Alarm With Sealed Lithium Battery Backup

SKU: P4010ACSCO | Ordering Code: 21027536  | UPC: 047871275366

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Kidde AC Hardwired Combination Photoelectric Smoke & CO Alarm With Sealed Lithium Battery Backup

  • Photoelectric Sensing Technology
  • 10-Year Sealed Lithium Battery
  • Voice Messaging System
  • Ambient Light Sensor
  • Smart Hush® Control
  • Flashing LED status ring allows easy identification of current state of alarm
  • Voice notification verbally announces "Fire! or "Warning! Carbon Monoxide!" to help distinguish between threats
  • Easy to install: Backup battery automatically activates when the unit is attached to the mounting bracket
  • Photoelectric Sensor: Smoke sensor contains advanced photoelectric sensor that may detect visable particles (associated with smoldering fires) sooner than ionazation alarms. 
  • Ambient Light Sensing: Establishes Day/Night cycle and delays chirping during the night until the next day cycle begins
  • Test / Hush Button: Tests alarm circuitry and activates Hush® feature to temporarily silence nuisance alarms for up to 10 minutes. End of Unit Life chirps can also be silenced
  • End of Unit Life Warning: Alerts user the alarm is in need of replacement 
  • 10-year Limited Warranty  
Full Specs



Model Number



Sealed-In Lithium Battery Backup
Depth (in)
For fixtures and ballasts, depth is the measurement of total distance from front to back of the product in inches.
Diameter (in)
Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.


10 year limited
Battery Backup
Has a backup battery to allow it to continue functioning in case of power failure.

Alarm Sensor Type


Hush Feature

Interconnects with other detectors so that if one goes off, all go off.
10-Year Battery
Detector has a long-life battery that doesn't need changing every twelve months.

Tamper Resistant

Humidity Range
The humidity range within which the detector will operate effectively.
10%-95% relative humidity, non-condensing
Temperature Range
The temperature range within which the detector will effectively operate.
40˚F (4.4˚C) to 100˚F (37.8˚C)
Voice Warning
Alarm features a spoken voice.

Electrochemical CO sensor

Combo CO2/Smoke
The detector will detect both CO2 and smoke.