Kidde 900-0234 Nighthawk Carbon Monoxide Alarm, Long Life AC Powered with Battery Backup and Digital Display
by Kidde
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Product Details
Manufacturer: KiddeModel: 21007309
Product features:
- Digital display shows level of carbon monoxide the unit is sensing (updates reading every 15 seconds)
- Peak level button displays the peak CO level recorded by the alarm since it was last reset or unplugged
- 9-volt battery backup provides continuous protection even during power outages
- Tamper-resist feature goes into constant alarm mode if unit has been unplugged or has come loose from the outlet
- 7-year end-of-life warning alerts user to replace CO alarm (40 percent longer than other CO alarms)
Tools and Hardware Reviews of Kidde 900-0234 Nighthawk Carbon Monoxide Alarm, Long Life AC Powered with Battery Backup and Digital Display
Customer Review: alerts at the 7-year mark, noisy unless you disable tamper-proof feature
Summary: 4 Stars
Long-lived CO alarm requires replacement at the 7-year mark, and has an annoying tamper-resistant feature (but it can be turned off).
After learning that home carbon-monoxide sensors have a finite lifespan, I decided to replace my oldest Nighthawk (well past its "expiration" as far as I can tell), with one of this new product line that is supposed to be effective for longer.
I found a few interesting differences between this new model and my older ones. One is that while this model is rated to last 7 years, it actually has planned obsolescence-- at the 7 year mark (from 1st power-up), it begins to chirp every 15 seconds. That means in 7 years, you must replace or discard the unit. Since I doubt the sensor completely fails between 6yrs364days and 7yrs, this seems like an attempt by Kidde to ensure sales volume (or to reduce liability by picking a "safe" cut-off). I'd have been happier with the ability to either service the unit (replace the sensor rather than discard the whole), or just have a "replace unit" warning light. I'd think it better to have a unit working with diminished capability, than to have no unit at all.
There are also alarms tied to the unit receiving AC power, with the unit sounding a loud tamper-warning otherwise. Eg, once the unit has a battery in it and is plugged in, if you were to simply unplug the unit, it would sound a very loud, persistent alarm. So to move it, you have to hold down the test button for 2-seconds first, to get a 2-minute unplugged grace period before the tamper-siren sounds.
I'm not sure if this feature is aimed at consumers with small misbehaved children, or aimed at those paranoid about malicious actions, but it seems out of place in an adults-only household. Reading the manual, I did discover that this feature can be disabled (hold down the button on the back, and use a screwdriver to slide a recessed switch to a disabled position). I'm glad the "feature" can be disabled, but considering the number of reviews here that mention the tamper-alarm, this work-around seems non-obvious.
Like most recent alarm devices, this unit will beep regularly when it has a low battery (a feature not present in my oldest Nighthawk), but thankfully it does have the ability to silence that beeping (for 12 hours) by holding down the test button (since these batteries seem to always fail during the middle of the night).
The manual states that using the recommended brands of 9v batteries, this unit will run on battery-only
for 20 hours.
I haven't had any CO problems, but this unit seems like it'll do the job, but I dock 1-star for overly noisy warnings and planned obsolescence.
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Description of Kidde 900-0234 Nighthawk Carbon Monoxide Alarm, Long Life AC Powered with Battery Backup and Digital Display
The nighthawk AC powered plug in carbon monoxide alarm has a digital display for ultimate protection of carbon monoxide. The digital displays show carbon monoxide in PPM allowing you to see if the levels are changing. The sleek design makes this alarm suiteable for all living areas. This alarm has a 7 year warranty.Protect your family from the dangers of carbon monoxide (CO) exposure with the Kidde 900-0234 Nighthawk Carbon Monoxide Alarm with Digital Display. The Nighthawk is an easy-to-install unit that provides reliable protection against the dangers of CO, and it has a digital display that shows CO levels in parts per million (ppm), allowing you to see if, how, and when levels change.
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 As sleek as it is safe, this alarm is designed for discreet installation. View larger. |
 Thanks to its battery backup, this alarm will continue working even if your house loses power. View larger. |
The leading cause of accidental poisoning deaths in North America, carbon monoxide (CO) is often referred to as the silent killer because it's odorless, tasteless, and invisible. Carbon monoxide poisoning can come about via a number of sources, including everyday items and appliances in your home or office. And because symptoms of CO poisoning mimic the flu or other common illnesses, CO poisoning can often go undiagnosed.
When placed on every level of your home, alarms like the Nighthawk 900-0234 can help protect everyone in the house from CO exposure by giving an unmistakable audible signal when CO levels have reached an unhealthy point.
Easy-to-Read Digital Display Shows CO Levels
Featuring a small, sleek, discreet design that's suitable for all living areas, the Nighthawk 900-0234 is preferred among CO alarms because of its digital display. This display clearly shows current levels of CO--from 30 to 999 ppm--and it updates every 15 seconds, giving you an indication of any abrupt changes or alarming trends. The display also shows the peak CO level recorded by the alarm since it was last reset or unplugged.
Loud Alerts Signal Elevated Levels and Low Battery Life
The Nighthawk 900-0234 immediately sounds a loud warning signal if CO has reached an elevated, unsafe level in your home, giving you plenty of time to leave the premises. You'll also hear a clearly audible alert when the product is nearing the end of its seven-year life, or the battery needs changing.
Battery Operated for Continuous Monitoring
For added convenience, the Nighthawk 900-0234 also has a battery backup, which means you won't have to worry about power outages. Unlike many A/C units, the Nighthawk will monitor continuously without interruptions. And because it has a seven-year product life, it's able to provide protection up to 40 percent longer than other units.
User-Friendly, Protective Features
For added peace of mind, the Nighthawk 900-0234 has a test/reset button that allows you to verify that the alarm is functioning properly, and a tamper-resistant feature that works by putting the unit into constant alarm mode if it has been unplugged or has come loose from the outlet.
Compliancy and Warranty Information
The Nighthawk 900-0234 is UL listed and is backed by a seven-year limited warranty.
About Kidde: A UTC Fire and Security Brand
Renowned for global leadership in fire detection and suppression, Kidde provides solutions ranging from portable fire extinguishers to advanced industrial controls such as flame detection and explosion suppression systems. Kidde is a UTC Fire and Security brand, with a history that's rich with innovations, from the patent of the Chubb Detector Lock in 1818 to the development of the world's first wireless networked smoke detectors in 2004.
What's in the Box
Kidde 900-0234 Nighthawk Carbon Monoxide Alarm, 9-volt battery, mounting hardware, and installation guide.
 Keep your family safe by placing alarms and extinguishers in each area of the house, and by having a fire escape plan. Click here for a detailed image. |
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