Smoke Detector Comparison Chart - 2019 By RelevantRankings.com – Read reviews and find the best deals on each model at www.relevantrankings.com/top-10-best-smoke-detectors/ Specs
Smoke Detector
First Alert BRK 3120B
First Alert BRK 9120LBL
First Alert BRK 9120B
Nest Protect 2nd Gen
Kidde RF-SM-DC
Kidde i9050
Kidde i4618
First Alert SCO501CN-3ST
Kidde KN-COSM-BA
First Alert SA320CN
Power Supply
Hardwired w/ battery backup
Hardwired w/ battery backup
Hardwired w/ battery backup
Hardwired w/ battery backup or Battery
Battery
Battery
Hardwired w/ battery backup or Battery
Battery
Battery
Battery
Hardwired (AC Power)
Yes
Yes
Yes
Yes
No
No
Yes
No
No
No
Battery (DC Power)
2 AA
Lithium
9V
6 AA
3 AA
9V
9V
2 AA
3 AA
2 AA
Interconnected
Yes
Yes
Yes
Yes - wireless
Yes - wireless
No
Yes
Yes - wireless
No
No
Ionization Sensor
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Photoelectric Sensor
Yes
Carbon Monoxide Detector
Yes
Yes
Yes
Yes
Yes
Yes
Best Price
$20.93
$21.27
$12.20
$119.00
$30.38
$10.36
$13.97
$49.49
$30.53
$22.99
Relevant Rankings Rating
9.2
9.1
9.1
9.1
9
8.9
8.9
8.9
8.8
8.7
Last Updated 2019