Kidde Nighthawk CO alarm front view with dual LEDs for quick status checks
Kidde Nighthawk CO alarm back view showing battery compartment and mounting options
Kidde Nighthawk CO alarm wall mount in a living room for steady monitoring
Kidde Nighthawk CO alarm tabletop placement on a shelf for easy reach
Kidde Nighthawk CO alarm LED indicators highlight status and alert during CO events

Kidde

Kidde Nighthawk KN-COB-B-LP Battery-Operated CO Alarm – 7-Year Life, UL Listed

High-performance tools and home improvement made for confident daily results

$45.59

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Why customers choose TaskHolt Tools

Meet the Kidde Nighthawk KN-COB-B-LP, a battery-operated carbon monoxide alarm designed for homes of all sizes. Its compact, low profile form blends with décor while delivering dependable CO monitoring even when the power is out.

Key advantages of the Nighthawk include battery powered protection during outages, a long seven year operating life, and a loud audible alert that helps you notice elevated carbon monoxide levels across rooms.

Why choose the Kidde Nighthawk

  • Battery powered protection during power outages thanks to three included AA batteries
  • Seven year operating life with a seven year end of life warning
  • Audible alarm rated at 85 decibels at 10 feet for clear alerts
  • Two color LEDs for at a glance status updates green means working, red means CO detected
  • Flexible mounting options for wall or tabletop placement
  • UL listed for safety and reliability

Real world use cases

In living rooms, bedrooms, or apartments, the Nighthawk sits unobtrusively on a wall or shelf. Its compact size and quiet operation fit spaces from cozy dens to busy kitchens, while a strong audible alert and visual LEDs offer immediate awareness without alarm fatigue.

During power outages or in areas with variable electrical supply, you still gain continuous monitoring. The design also makes it suitable for rental homes and cabins where safety compliance and easy maintenance matter.

How it works and maintenance

Test and reset with a single button to verify operation. The green LED flashes every 30 seconds to show the unit is functioning, while the red LED glows if CO is detected. When it detects CO, the alarm emits four beeps, followed by five seconds of silence, and repeats.

For upkeep, replace batteries as needed and be aware of the seven year end of life warning to plan for replacement. The unit ships with three AA batteries and clear operating instructions.

What’s in the box

  • One Kidde Nighthawk KN-COB-B-LP CO alarm
  • Three AA batteries
  • Operating instructions

FAQ

Q: What comes in the box with the Kidde Nighthawk KN-COB-B-LP?

A: One Kidde Nighthawk KN-COB-B-LP CO alarm, three AA batteries, and operating instructions.

Q: How loud is the alarm and how does it indicate CO detection?

A: The alarm emits four beeps at 85 dB from 10 feet, with a brief silence, then repeats.

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