Kidde KN-COPP-3 Plug-In Carbon Monoxide Detector
- Power Source: Corded Electric
- Sensor Type: Ionization
- Alarm: Audible
- Product Style: 3rd Edition
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A straightforward plug-in CO detector with a digital readout and battery backup, well suited to a single room near an outlet rather than a whole-home interconnected system.
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ASIN: B00002N86AModel: KN-COPP-3Category: Smoke Detectors & Fire Alarms
Overview
Plug-in carbon monoxide detector from Kidde with digital display and 9-volt battery backup, meant for a standard 120V outlet in a bedroom hallway or living area where continuous CO monitoring matters.
This is a plug-in unit, not hardwired or battery-only, so placement is limited to an outlet near where code recommends CO coverage, such as outside sleeping areas. The 9V backup keeps it running through a power outage, and the digital display lets you check the actual reading instead of waiting for an alarm threshold to trip.
- Plug-in installation, no wiring
- Digital CO level display
- 9V battery backup
- 85 dB alarm with peak level memory
Who it's for
Homeowners and renters who want a low-effort carbon monoxide monitor near a gas furnace, gas stove or attached garage without running any wiring. Renters who move often will appreciate that it simply plugs in and unplugs.
Pros and cons
- Plugs into any standard outlet, no wiring
- Digital display shows the live CO reading, not just alarm state
- 9V battery backup covers power outages
- Peak Level Memory logs the highest reading recorded
- Placement limited to an outlet location
- No stated interconnect with other alarms
- Detects carbon monoxide only, not smoke
Performance notes
The sensor reports continuously to the digital display, so a rising CO level can be read directly rather than inferred from a beep pattern. Peak Level Memory retains the highest reading recorded, which is useful for showing a technician after a suspected exposure. The 85 dB alarm is loud enough to wake most sleepers once it engages.
Specifications
| Brand | Kidde |
|---|---|
| Model | KN-COPP-3 |
| Dimensions & fit | |
| Item Dimensions D X W X H | 1.7 × 3.8 × 6.1 inches |
| Capacity & performance | |
| Upper Temperature Rating | 100 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Enclosure Material | ABS |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Residential |
| Included components | |
| Unit Count | 1 |
| Warranty & support | |
| Manufacturer Warranty Description | 10 year limited |
| Other details | |
| Sensor Type | Ionization |
| Alarm | Audible |
| Product Style | 3rd Edition |
| Number Of Items | 1 |
| Mfr Part Number | 900-0076 |
| Builtin Media | One 9V Battery, One CO Alarm, Model KN-COPP-3, One Mounting Hardware Packet (for Wall-Mount Option), One User Manual |
| Item Type Name | Carbon Monoxide Detector |
| Operating Humidity | 5% to 95% relative humidity, non-condensing |
Frequently asked questions
Does the Kidde plug-in detector need batteries?
It plugs into a 120V outlet as primary power; the included 9V battery is a backup for outages.
What does the digital display show?
It shows the live carbon monoxide level the sensor is reading, not just an on/off alarm state.
Is this also a smoke detector?
No, based on its title and spec sheet this model is a carbon monoxide detector only.