Smoke & Gas Detectors
smoke & gas detectors — pre-owned
Browse 1,250 smoke & gas detectors — pre-owned on eBay — listings updated every few minutes. All items are pre-owned and sold by eBay sellers directly.

Nest Protect 2nd Gen 06C Smoke & Carbon Monoxide Alarm, Wired, expires 2028
📅 Expiration Date: 2028. This is aGoogle Nest Protect (2nd Generation) Smoke & Carbon Monoxide Alarm. The unit has been fully tested and is in 100% working condition. Nest Protect Unit (Main Body).
You save $14.96

Google Nest Protect 2nd Gen S3000BWES - Expires 2029-2033 - UNIT ONLY No Bracket
Google Nest Protect 2nd Generation (S3000BWES). MPN: S3000BWES. 1x Google Nest Protect 2nd Gen Unit (Selected Year). Model: Protect 2nd Gen (Battery Version). No mounting bracket, backplate, or screws included.

Airthings 2920 Wave Mini indoor Air quality monitor (Bundle of 2)
The Airthings 2920 Wave Mini indoor Air quality monitor is a set of two sleek white devices that monitor and improve indoor air quality. Weighing only 0.3 lb, they are lightweight and easy to install in any room.

Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector
Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector Alarm. El estado es Used. Se envió con USPS Ground Advantage.

Google Nest T5000SF Temperature Sensor for Nest Learning Thermoset Nest E UVG
Works with the Nest Learning Thermostat (3rd gen) and the Nest Thermostat E. Nest Sensor. Requires one CR2 3V lithium battery. Back Cover.

Google Nest Protect CO & Smoke Detector Alarm - 2nd Gen - WIRED - NOT EXPIRED
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

Google Nest Protect CO & Smoke Detector Alarm - 2nd Gen - WIRED - EXPIRES 9/2028
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

First Alert Z-WAVE Smoke & Carbon Monoxide Alarm (ZCOMBO) - with New Batteries
First Alert Z-WAVE Smoke & Carbon Monoxide Alarm with new batteries and hardware as pictured.

Google Nest Protect CO & Smoke Detector Alarm - 2nd Gen - WIRED - EXPIRES 7/2028
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

HONEYWELL ADEMCO SECURITY 5808W3 WIRELESS PHOTOELECTRIC SMOKE/HEAT DETECTOR USED
1 x 5808W3 Smoke/Heat Detector - used. Built-in wireless transmitter, temporal code 3 sounder. The technician is able to quickly and easily clean the detector chamber without disassembling the detector head.

ONE KIDDE FIREX 120V WIRING HARNESS PIGTAIL USED (SET OF 4)
Please view photos carefully prior to purchase. This set includes 4 used Kidde pigtail terminal wires. Fits most kidde firex detectors, but please verify proper fit for yours. If you have any questions please feel free to reach out! Ships within 24 hours!

Google Nest Protect CO Smoke Detector Alarm 2nd Gen WIRED - EXPIRED! PARTS ONLY!
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. PARTS ONLY! This unit is EXPIRED and the Nest app will not allow you to add it.

Kidde KN-COPE-IC Combination Smoke / CO Alarm / Detector w/ Base Free Shipping
You are buying a Used Kidde KN-COPE-IC Combination Smoke / CO Alarm / Detector w/ Base.

Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector
Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector Alarm. El estado es Used. Se envió con USPS Ground Advantage.

7 --Google Nest Protect Battery Smoke Detector Carbon Monoxide Alarm Expired
The Google Nest Protect Battery Smoke Detector is a white wireless alarm designed to detect both smoke and carbon monoxide.

Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector Alarm
Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector Alarm. El estado es Used. Se envió con USPS Ground Advantage.

Google Nest Protect Hardwired Smoke/CO2 Detectors Lot Of 3 (04/27,05/26,06/26)
Google Nest Protect Hardwired Smoke/CO2 Detectors Lot Of 3. Expiration dates are in the photos. two expiring soon, one April of 2027

Honeywell ADT DSC WS4933 Carbon Monoxide Detector - preowned
Made in Canada, this carbon monoxide detector provides peace of mind and protection for you and your family. 1 x WS4933 Carbon Monoxide - used.

Kidde i12060A AC Hardwired Smoke Alarm w. Mount + Wiring Harness - Sept 25 2018

Google Nest Protect BATTERY 06A Exp. Jun 2031 - Door doesn’t Stay Closed
Doesn’t seem broken.

First Alert BRK PC1210V Smoke & Carbon Monoxide Detector Alarm w/10 Year Battery

Google Nest Protect Smart Smoke Alarm Carbon Monoxide Detector Battery Exp. 2032
This is for a perfect condition Google Nest Protect Smart CO and Smoke Detector. Since I have 3 of them, they each expire in a different month in 2032, ranging from March to November 2032. My other detectors expired, so we have moved on from Nest (which is sad).

First Alert 2-in-1 Smoke & Carbon Monoxide Alarms with Voice Alerts - 2 Pack

Google Nest Protect CO & Smoke Detector Alarm - 2nd Gen - WIRED - EXPIRES 2028
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

Google Nest Protect CO Smoke Detector Alarm - 2nd Gen - WIRED - EXPIRES 07/2028
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

Used Airthings 2350 Battery Operated Digital Radon Detector LED Display Portable
For sale is a used airthings digital radon detector. Model 2350.
You save $1.51

Google Nest Protect CO Smoke Detector Alarm - 2nd Gen - WIRED - EXPIRES JULY '28
Used Google Nest Smoke and Carbon Monoxide (CO) detector alarm in EXCELLENT CONDITION. Original box, mounting plate, and wire are included. This is the 2nd Generation WIRED version.
You save $15.00

Lot of 2 Carbon Monoxide Alarms Kidde KN-COB-LP2 and 1 Unbranded Alarm Tested
This product is a lot of 2 Carbon Monoxide Alarms. The white-colored alarms weigh 0.5 lb each and are manufactured in China. Perfect for peace of mind against potential carbon monoxide leaks. Both are portable.
You save $1.60

BRK First Alert7010BSL Smoke Strobe LED Alarm 177 Strobe parts or repair 20pcs
BRK First Alert7010BSL Smoke Strobe LED Alarm 177 Strobe parts or repair 20pcs. 12 model 7010bsl and 8 model SL177. Some of these may work I know that when we put batteries in a few some turned on some did not. I'm selling all of these as parts for repair only as is item exactly as described a lot of 200 will ship. Any questions please ask me for purchasing this is a partial repair item exactly as described so there are no refunds for this. Free shipping to the continental United states.

Google Nest Protect Smoke & Carbon Monoxide Detectors White Wi-Fi Battery
Selling because I am getting away from nest. Still works perfectly

Lot of 5 Airthings View Plus Smart Air Quality Monitor AS-IS Parts Only
Sensors: Radon, PM2.5, CO2, VOC, Humidity, Temp, Pressure. UNIT DETAILS & TESTING: . - Model: View Plus. - Power: All units power on successfully via both USB-C and batteries.

Nest Labs Protect 05C Smoke & Carbon Monoxide Gas Detector Wired EXPIRED - Lot 3
No other accesories included just the detector no screws or wires. If the item is unopened or unused and uses a battery, a test battery may not be included. The pictures shown are for reference purposes.
You save $18.00

Google Nest Protect Smoke Alarm and Carbon Monoxide Detector - Scratch & Dent
• A Light in the Dark: Usually Nest Protect has its light turned off but when you walk underneath it Pathlight can light your way. This will not impair use of the device.
You save $125.42

2030 Expiration - Google Nest Protect Battery Smoke & Carbon Monoxide Detector
Include the bracket and USB charger as shown in photo. Please see all photos for visual reference. The Google Nest Protect Battery Smoke & Carbon Monoxide Detector is a reliable and advanced safety device for homes. With a sleek white design and model by Google Nest, this detector is powered by batteries and does not include a battery included. It is specifically designed to detect both smoke and carbon monoxide, providing peace of mind and security for families. The 2030 Expiration date ensures that the product remains effective and up-to-date with the latest technology for home security.
You save $5.00

Google Nest T5000SF Temperature Sensor No Battery (Sensor ONLY)
Used good condition. Battery is NOT included. Sensor ONLY. No any other accessories. Works great! Sensor ONLY. Battery, Screw. What's not included.

Google Nest Temperature Sensor T5000SF (A0106)
Requires Nest Learning Thermostat or Nest Thermostat E.

AIRTHINGS 2350 DIGITAL RADON DETECTOR W CONTINUOUS MONITORING (E10049770)
I wanted to test my home before selling. I'm glad I did. I used item for about 10 minutes and it worked very well. Comes with batteries. Item is like new. Selling as used at reduced pricing. The item you see in pictures is what you will actually receive. Super fast free same day shipping m-f by 2pm est via usps.
You save $1.62

FIREX - Smoke / CO Alarms (Model: FADCM & FADC). . .QTY: 5. . .USED/PARTS/REPAIR
Mounting plates.. QTY: 5.. NOTE that the plates for the FADCM alarms differ from the FADC alarms. Instruction guides for both the FADCM and FADC alarms. Smoke / CO (FADCM) alarms.. Manufactured year: 2006.. QTY: 3.

Analox CO Clear Co Alarm
MODEL:Analox CO Clear Co Alarm P/N CO 2510x56XXY16. CONDITION:Pre-Owned, Untested and In fair Condition has signs of use in the past ! What you see is what you get nothing more nothing less. what you see in the photos is exactly what You will receive no other accessories included!
You save $32.00

KIDDE 10 YEAR LONG LIFE SMOKE & CARBON MONOXIDE COMBINATION ALARM K10SCO - WHITE
• Voice Alarm feature. • Hush button. • Test/Reset button.