
Nighthawk Carbon Monoxide Alarm
40% LONGER LIFE THAN 
OTHER CO ALARMS
NEW
LONGLIFE:
NIGHTHAWK
TECHNOLOGY
Worldís Most Accurate
Carbon Monoxide Alarm
*
TM
AC Powered, Plug-In with Battery Backup
Part Number 900-0235   Model KN-COB-DP-LS 
Tamper Resist Feature
Unit alerts you if it has been unplugged  
or has come loose from the outlet.
Two LED’s
Red – Illuminates when in alarm mode.  
Green – AC power is present, normal operation.
Test/Reset Button
Tests CO alarm circuit operation and allows  
you to immediately silence the alarm.
End of Life Alarm 
Alerts user to replace CO alarm after  
7-years of operation.
Description
The Nighthawk 900-0235 AC Powered, Plug-In carbon 
monoxide alarm with battery backup is an easy to  
install unit that provides reliable protection against the 
dangers of carbon monoxide. Written information and 
instruction make this unit’s operation easy to understand for anyone.  The Nighthawk AC/DC Basic alarm 
has a small, sleek design that is suitable for all living 
areas and has a 7-year limited warranty. 
Consumer Benefits
The Nighthawk 900-0235 provides you and your family with a loud warning signal against the dangers of 
elevated carbon monoxide levels in your home. The 
battery backup feature provides continuous monitoring 
of CO levels, even during power outages when AC-only 
units are not providing protection. The Nighthawk CO 
alarm has a 7-year product life, providing 40% longer 
protection than other CO alarms.
*Based on accuracy claims of major manufacturers
Features and Benefits
• Tamper Resist Feature – Unit goes into constant 
alarm mode if it has been unplugged or has come 
loose from the outlet.
• 9V Battery Backup – Provides continuous protection 
even during power outages.
• Test/Reset Button – Tests the unit for proper  
operation. Resets the Carbon Monoxide alarm.
• 7-Year End of Life Warning – Alerts user to replace 
CO alarm after 7-years of operation. (40% longer 
than other CO alarms)
• UL Listed – Lifelong Warranty

Nighthawk Carbon Monoxide Alarm  
AC Powered, Plug-in with Battery Backup
Part Number 900-0235 
Model KN-COB-DP-LS
Architectural and Engineering 
Specifications
The carbon monoxide alarm shall be Kidde Model KN-COB-DPLS (part number 900-0235) or approved equal. It shall be powered 
by a 120VAC, 60 Hz source, along with a 9V battery backup.
The temperature operating range shall be between 40°F and 
100°F (4°C and 38°C) and the humidity operating range shall be 
5%-95% relative humidity.
The CO sensor shall be of a fuel cell design and shall meet the 
sensitivity requirements of Under writers Laboratories UL2034 
Single and Multiple Station Carbon Monoxide Alarms.
The alarm shall include an integral plug that can be installed 
in any electrical outlet following the UL/NFPA/Manufacturer’s 
recommended guidelines. The unit shall have a green LED that will 
illuminate continuously and indicate that the CO alarm is receiving 
power and the alarm circuit is functioning.
The alarm shall include a test /reset button. If pressed and released during normal operation, it shall electronically simulate the 
presence of CO and cause the unit to go into alarm. This sequence 
tests the unit’s electronics to ensure proper operation. If pressed 
during alarm mode, the unit will be silenced and will begin monitoring CO levels again.
The alarm shall include Tamper Resist Feature. If activated, unit 
shall go into constant alarm mode until the unit is replaced into 
the wall socket or the battery is removed.
In accordance with UL 2034, 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 alarm shall include a piezoelectric horn that is rated at 85 
decibels at 10 feet. When the unit detects carbon monoxide, the 
alarm pattern will be four (4) short beeps – followed by five (5) 
seconds of silence – followed by four (4) short beeps.
The unit shall be listed to UL 2034. It shall also include a  
7-year manufacturer’s limited warranty.
Technical Specications
Part Number:  900-0235 
Model:  KN-COB-DP-LS 
Power Source:  120VAC, 60HZ, 60mA max 
  9V battery back-up 
Sensor:  Electrochemical 
Audio Alarm:  85dB at 10ft 
Temperature Range:  40˚F (4˚C) to 100˚F (38˚C) 
Humidity Range:  10%-95% relative humidity (RH) 
Size:  3.0” x 5.6” x 1.5” 
Weight:  .62 lbs with battery 
Interconnects:  No 
Warranty:  7 year limited
*Based on accuracy claims of major manufacturers
Ordering Information
21007308 UPC: 0- 47871-07308-5, 21007336 UPC: 0-47871-07336-8, 21007329 UPC: 0-47871-07329-0
Part      Dimensions    Case/  Skid 
Number  I 2 of 5  Pack Quantity  (w x d x h inches)  Weight  Skid  Weight
900-0235**  N/A  Individual (Clam)  7.5 x 2 x 11   1.54 lbs.  N/A  N/A
900-0235**  N/A  Individual (Box)  3.44 x 2.38 x 6   1.54 lbs.  N/A  N/A
21007308  100-47871-07308-2  Cutcase (4 units) Clam  7.94 x 11.88 x 11.50  6.16 lbs.  60  369 
21007336  100-47871-07336-5  Cutcase (8 units) Clam  7.94 x 21.63 x 11.5  12.32 lbs.  36  443 
21007329  100-47871-07329-7  Cutcase (6 units) Gift Box  7.5 x 8 x 6.5   9.24 lbs.  36  324
**Not for sale by individual unit
Distributed by:
1016 Corporate Park Drive 
Mebane NC 27302 
1-800-880-6788  
www.kidde.com
  KL-900-0235 sheet  rev. 01-2009