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Best selling products: Best
System Sensor Home Smoke & Gas Detectors
Bestselling
Top Rated
1
Rank 1
Google Nest Protect Smoke and Carbon Monoxide Alarm 2nd Gen - S3000BWES
(406)
$119.00 New
$119.00 New
$94.99 Used
$94.99 Used
2
Rank 2
Google Nest Protect Carbon Monoxide Smoke Detector - S3003LWES
(204)
$16.00 New
$16.00 New
$14.54 Used
$14.54 Used
3
Rank 3
Kidde Code One Combo Alarm Smoke Wired 900-CUAR - White (21032251)
(5)
$28.49 New
$28.49 New
---- Used
No used products available
4
Rank 4
Kidde i4618 Firex Hardwired Smoke Alarm
(2)
$24.99 New
$24.99 New
---- Used
No used products available
5
Rank 5
Airthings Wave Radon Battery Operated Smart Radon Detector 2951 -
(3)
$38.00 New
$38.00 New
$35.00 Used
$35.00 Used
6
Rank 6
Kidde Smart Smoke Detector WiFi Alexa Compatible Hardwired Mobile Alerts
(1)
$18.99 New
$18.99 New
---- Used
No used products available
7
Rank 7
2025 SITERWELL Hardwired Combination Carbon Monoxide & Smoke Alarm Authentic
(1)
$48.99 New
$48.99 New
---- Used
No used products available
8
Rank 8
Kidde 21007581 Hardwired Smoke Alarm with Battery Backup
(220)
$27.95 New
$27.95 New
$23.99 Used
$23.99 Used
9
Rank 9
Kidde Smart Smoke Carbon Monoxide Alarm Detector - P4010ACSCOAQWF
(7)
$26.39 New
$26.39 New
---- Used
No used products available
10
Rank 10
Honeywell 5800SMOKEV Wireless Smoke Heat Detecto Factory / w Battery
(2)
$60.00 New
$60.00 New
$32.00 Used
$32.00 Used
11
Rank 11
BRK First Alert 9120B Smoke Detector
(569)
$21.26 New
$21.26 New
$15.25 Used
$15.25 Used
12
Rank 12
Kidde 10 Year Sealed-In Battery-Powered Ionization Smoke Alarm
(7)
$17.56 New
$17.56 New
---- Used
No used products available
13
Rank 13
Kidde 30CUA10 Smoke & Carbon Monoxide Alarm Hardwired 10-Year Battery Adapter
$39.55 New
$39.55 New
---- Used
No used products available
14
Rank 14
3 BOXES Kidde Smoke Detect 10-Yr. Battery Power LED Warn Light Indicators 2 PACK
$30.36 New
$30.36 New
---- Used
No used products available
15
Rank 15
Kidde P4010ACSAQ-WF Indoor Smoke Alarm - White
(3)
$19.99 New
$19.99 New
---- Used
No used products available
16
Rank 16
Google Nest Temperature Sensor - White (T5000SF)
(84)
$19.99 New
$19.99 New
$18.99 Used
$18.99 Used
17
Rank 17
Kidde P4010ACSCO-WF Smoke + Carbon Monoxide Smart Alarm
(1)
$35.97 New
$35.97 New
---- Used
No used products available
18
Rank 18
6 PACK SITERWELL Hardwired Interconnect Smoke Alarm GS562A 9V Backup
$131.99 New
$131.99 New
---- Used
No used products available
19
Rank 19
Digital Radon Detector Airthings 2350
(99)
$46.00 New
$46.00 New
$43.99 Used
$43.99 Used
20
Rank 20
BRK SC9120B Smoke & Carbon Monoxide Detector
(24)
$55.00 New
$55.00 New
$28.99 Used
$28.99 Used
21
Rank 21
Kidde 900-CUAR Smoke & Carbon Monoxide Detector Alarm - 21032250
(8)
$29.99 New
$29.99 New
$28.95 Used
$28.95 Used
22
Rank 22
Lot Of (6) Kidde Firex Smoke Detector Hardwired
$25.19 New
$25.19 New
---- Used
No used products available
23
Rank 23
Airthings 223 Corentium Home Radon Detector
(191)
$61.99 New
$61.99 New
$46.89 Used
$46.89 Used
24
Rank 24
(6) Pack Kidde 30CUA10 Smoke Carbon Monoxide Alarm Hardwired 10Year Battery
$42.95 New
$42.95 New
---- Used
No used products available
25
Rank 25
Kidde Smoke Carbon Monoxide Detector Wire- Interconnect 900-0225
(3)
$39.99 New
$39.99 New
---- Used
No used products available
26
Rank 26
Kidde 30CUAR Detect Smoke Carbon Monoxide Alarm - smoke Detectors
(3)
$29.74 New
$29.74 New
---- Used
No used products available
27
Rank 27
Ring 4SS1S8-0EN0 Alarm Smoke & CO Listener
(16)
$22.99 New
$22.99 New
$17.99 Used
$17.99 Used
28
Rank 28
Kidde KN-COEG-3 Explosive Gas Alarm Carbon Monoxide Alarm Detector with Battery
(111)
$28.00 New
$28.00 New
$19.99 Used
$19.99 Used
29
Rank 29
Kidde 30CUAR-V Combo Smoke CO Detector - MISSING MOUNTING PLATE
$38.99 New
$38.99 New
---- Used
No used products available
30
Rank 30
First Alert 9120B6CP Smoke Alarm - 6 Pack
(38)
$89.26 New
$89.26 New
$12.34 Used
$12.34 Used
31
Rank 31
Kidde 21007588 120V AC wire-in Hush Smoke Alarm with Battery Backup - 4 Pack
(42)
$78.99 New
$78.99 New
$29.99 Used
$29.99 Used
32
Rank 32
Kidde 21006377 Hardwired Combination Carbon Monoxide & Smoke Alarm
(181)
$70.00 New
$70.00 New
$60.00 Used
$60.00 Used
33
Rank 33
Kidde 30CUAR-V Hardwired Smoke & Carbon Monoxide Detector AA Battery Backup
$34.99 New
$34.99 New
---- Used
No used products available
34
Rank 34
Kidde Kitchen Combination Smoke Carbon Monoxide Alarm 10-Year Lithium Battery
(33)
$29.98 New
$29.98 New
$24.99 Used
$24.99 Used
35
Rank 35
First Alert BRK SMICO105-AC Smoke/Carbon Mono Alarm Pack of 6 Pieces
(4)
$54.95 New
$54.95 New
---- Used
No used products available
36
Rank 36
Kidde 21006378 Hardwire Smoke Alarm Detector
(124)
$27.85 New
$27.85 New
---- Used
No used products available
37
Rank 37
First Alert Z-Wave Smoke & Carbon Monoxide Detector Works with Ring
(31)
$24.99 New
$24.99 New
$15.72 Used
$15.72 Used
38
Rank 38
Kidde P3010CU Smoke and Carbon Monoxide Combination Detector - White, 2 Pack
(20)
$59.50 New
$59.50 New
---- Used
No used products available
39
Rank 39
X-SENSE 3pack Combination Smoke and Carbon Monoxide Alarm - 10 YR Batt Life SC07
(6)
$25.00 New
$25.00 New
---- Used
No used products available
40
Rank 40
First Alert Smoke Detector - White
(19)
$15.00 New
$15.00 New
---- Used
No used products available
41
Rank 41
Airthings 2950 Smart Radon Detector - White
(7)
$34.99 New
$34.99 New
---- Used
No used products available
42
Rank 42
First Alert CO710 Carbon Monoxide Detector with Digital Temperature Display (1039753)
(10)
$27.95 New
$27.95 New
$9.00 Used
$9.00 Used
43
Rank 43
Kidde i9010 Smoke Alarm
(11)
$18.88 New
$18.88 New
---- Used
No used products available
44
Rank 44
First Alert CO605 Carbon Monoxide Plug-In Alarm with Battery
(32)
$18.90 New
$18.90 New
$12.49 Used
$12.49 Used
45
Rank 45
Kidde 21026056 Model i9040 Ionization Smoke Alarm
(185)
$18.00 New
$18.00 New
$13.50 Used
$13.50 Used
46
Rank 46
Google Nest 2nd Gen Protect Smoke and Carbon Monoxide Alarm Detector with Battery - White
(39)
$149.99 New
$149.99 New
$39.99 Used
$39.99 Used
47
Rank 47
BRK 1046858 FirstAlert Ionization Smoke Alarm with Lithium Battery (SMI110)
$17.99 New
$17.99 New
---- Used
No used products available
48
Rank 48
Kidde 20SA10 Hardwired Interconnected Smoke Detector with Photoelectric sensor
(3)
$24.99 New
$24.99 New
---- Used
No used products available
49
Rank 49
Kidde 201025759 120V Tamper Resistant Plug-In Carbon Monoxide Detector
(56)
$9.95 New
$9.95 New
$9.75 Used
$9.75 Used
50
Rank 50
Kidde 9CO5-LP2 Battery Powered Carbon Monoxide Alarm
(106)
$17.89 New
$17.89 New
---- Used
No used products available
51
Rank 51
Kidde 21029886 Firex Smoke Detector Hardwired with Battery Backup Front Load D
(21)
$29.99 New
$29.99 New
---- Used
No used products available
52
Rank 52
First Alert Photoelectric Smoke Alarm 2 Pack
(65)
$49.99 New
$49.99 New
$22.00 Used
$22.00 Used
53
Rank 53
Kidde KN-COSM-BA Battery Operated Combination Smoke and Carbon Monoxide Alarm - White
(30)
$69.99 New
$69.99 New
---- Used
No used products available
54
Rank 54
Airthings 2928 Wave Mini Battery Operated Smart Indoor Air Quality Monitor
(1)
$10.50 New
$10.50 New
---- Used
No used products available
55
Rank 55
First Alert 1039868 Battery-Powered Smoke & Carbon Monoxide Alarm - White
(84)
$24.99 New
$24.99 New
---- Used
No used products available
56
Rank 56
Airthings Wave Mini Smart Indoor Quality Monitor Model 2928
(10)
$17.95 New
$17.95 New
---- Used
No used products available
57
Rank 57
2gig SMKT8 Smoke, Heat and Freeze Detector (2GIG-SMKT8-345)
(4)
$64.99 New
$64.99 New
---- Used
No used products available
58
Rank 58
Kidde FireX KN-COPE-IC Smoke & Carbon Monoxide Alarm 21007624 Photoelectric
(51)
$46.00 New
$46.00 New
$24.99 Used
$24.99 Used
59
Rank 59
Kidde Firex Battery Operated Smoke and Carbon Monoxide Detector - White
(39)
$19.99 New
$19.99 New
---- Used
No used products available
60
Rank 60
Kidde Smoke and Carbon Monoxide Detector (P4010ACSCO-W)
(4)
$45.99 New
$45.99 New
$25.00 Used
$25.00 Used
61
Rank 61
First Alert SCO5CN Combination Smoke and Carbon Monoxide Alarm
(1)
$22.99 New
$22.99 New
---- Used
No used products available
62
Rank 62
BRK Hard-Wired w/Battery Back-Up Ionization Smoke &Carbon Monoxide Detector 6pc
$300.00 New
$300.00 New
---- Used
No used products available
63
Rank 63
KIDDE COMBO SMOKE Carbon Monoxide Alarm Detector 30CUD10-V Voice Wired 10 Year
$34.00 New
$34.00 New
---- Used
No used products available
64
Rank 64
First Alert CO400 Carbon Monoxide Alarm Detector
(173)
$16.00 New
$16.00 New
$14.00 Used
$14.00 Used
65
Rank 65
4518 Firex Smoke Alarm Detector 120vac 1z-2070-a11
(1)
$26.99 New
$26.99 New
---- Used
No used products available
66
Rank 66
BRK 7010B 120V AC/DC Photo Smoke Alarm
(1)
$19.90 New
$19.90 New
---- Used
No used products available
67
Rank 67
X-Sense Combination SC07 6-pack Interconnected Smoke & CO Alarm
(5)
$24.99 New
$24.99 New
---- Used
No used products available
68
Rank 68
sd Kidde Smoke & CO Detector 30CUA10-V Hardwired 10-Year Battery Voice Alerts
(3)
$45.00 New
$45.00 New
$22.99 Used
$22.99 Used
69
Rank 69
First Alert 1039871 Alarm Smoke - White
(37)
$23.99 New
$23.99 New
---- Used
No used products available
70
Rank 70
BRK- (6) Count (6) Pack - SMCO210 - AC Battery Smoke & Carbon Monoxide Detector
$99.99 New
$99.99 New
---- Used
No used products available
71
Rank 71
Honeywell Farenhyt Series Black 15-32 VDC Intelligent Addressable Photoelectric Smoke Detector (IDP-PHOTO-W)
$80.46 New
$80.46 New
$55.00 Used
$55.00 Used
72
Rank 72
Kidde Hardwired Smoke and Combination Detector Alarm Adapters 21028461
(4)
$9.00 New
$9.00 New
---- Used
No used products available
73
Rank 73
Kidde Carbon Monoxide Alarm 120v Direct Wire W Battery Backup 900-0120 B24
(15)
$29.00 New
$29.00 New
$25.00 Used
$25.00 Used
74
Rank 74
First Alert C0400 Carbon Monoxide Alarm - White
(39)
$16.49 New
$16.49 New
$9.99 Used
$9.99 Used
75
Rank 75
System Sensor CO1224T Carbon Monoxide Detector
(7)
$49.99 New
$49.99 New
$20.00 Used
$20.00 Used
76
Rank 76
3 Kidde Detect Smoke Alarm Model 20SD10 Open Box. Read
$29.00 New
$29.00 New
---- Used
No used products available
77
Rank 77
Code One I9010 Lithium Ion Battery Operated Smoke Alarm - 3 Pack
(16)
$37.99 New
$37.99 New
---- Used
No used products available
78
Rank 78
KIDDE Detect Smoke Alarm Model 20SA10 - Hardwired 10 YEARS BATT.
$20.95 New
$20.95 New
---- Used
No used products available
79
Rank 79
First Alert BRK SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide ...
$39.89 New
$39.89 New
---- Used
No used products available
80
Rank 80
2 BRK 9120BP First Alert Smoke Alarm Detector Battery Backup 120v Hardwired
(6)
$22.99 New
$22.99 New
---- Used
No used products available
81
Rank 81
Honeywell 5800COV Carbon Monoxide CO Detector Replaced 5800CO
$76.00 New
$76.00 New
$40.00 Used
$40.00 Used
82
Rank 82
BRK HD6135FB Smoke Alarm
(21)
$29.90 New
$29.90 New
---- Used
No used products available
83
Rank 83
Kidde C3010 Carbon Monoxide Detector Alarm With 10 Year Battery
(9)
$25.19 New
$25.19 New
---- Used
No used products available
84
Rank 84
Kidde 4mco Mains Powered Carbon Monoxide Alarm
(21)
$21.95 New
$21.95 New
$14.95 Used
$14.95 Used
85
Rank 85
Kidde 30CUDR-V Battery-Operated Combination Smoke & Carbon Monoxide Detector
(1)
$29.99 New
$29.99 New
---- Used
No used products available
86
Rank 86
First Alert Smoke & Fire Alarm Battery Included Sa303cn A8
(11)
$17.56 New
$17.56 New
---- Used
No used products available
87
Rank 87
(2) BRK ELECTRONICS SMI100 BATTERY OPERATED SMOKE ALARMS-
$18.79 New
$18.79 New
$12.90 Used
$12.90 Used
88
Rank 88
Kidde 21027451 Plug in Carbon Monoxide Alarm With Battery Back-up Hush Feature
(12)
$14.99 New
$14.99 New
$12.00 Used
$12.00 Used
89
Rank 89
USI Electric MCN108 Carbon Monoxide & Natural Gas Alarm 120v W/battery Backup
$51.00 New
$51.00 New
---- Used
No used products available
90
Rank 90
Kidde C3010 Carbon Monoxide Detector Monitor Alarm 10-Year Lithium Battery
$19.00 New
$19.00 New
---- Used
No used products available
91
Rank 91
First Alert CO605 Plug-In Carbon Monoxide Alarm
(7)
$14.62 New
$14.62 New
$9.99 Used
$9.99 Used
92
Rank 92
Kidde 21007267 Nighthawk Carbon Monoxide Alarm
(13)
$24.99 New
$24.99 New
$11.75 Used
$11.75 Used
93
Rank 93
Kidde 30CUD10 Smoke & Carbon Monoxide Detector 10-Year Battery Powered LED
$28.34 New
$28.34 New
---- Used
No used products available
94
Rank 94
First Alert Smoke and Fire Alarm Set of 2 White Photoelectric Sensor Sa710cp2
(11)
$15.95 New
$15.95 New
$7.46 Used
$7.46 Used
95
Rank 95
Honeywell 5800COMBO Carbon Monoxide Detector
(3)
$179.99 New
$179.99 New
$69.00 Used
$69.00 Used
96
Rank 96
Kidde i12040 Ionization Smoke Detector with Battery Backup - Pack of 6
(157)
$68.21 New
$68.21 New
---- Used
No used products available
97
Rank 97
BRK Brands CO5120BN Hardwire Carbon Monoxide Alarm With Battery Backup
(17)
$39.49 New
$39.49 New
---- Used
No used products available
98
Rank 98
Kidde KN-COB-LCB-A Tamper Resistant Plug-In Carbon Monoxide Alarm with Battery Backup
(12)
$9.99 New
$9.99 New
---- Used
No used products available
99
Rank 99
Kidde 4" Smoke Detector 10SDR & Carbon Monoxide KN-COB-LP2 2-Pack combo
$25.20 New
$25.20 New
---- Used
No used products available
100
Rank 100
Kidde Lifesave Smoke Alarm Kitchen Model P9050 With Photoelectric Sensor -
$16.11 New
$16.11 New
---- Used
No used products available
