Kidde: 10 Models Side by Side

10 models	1 First Alert CO400 Carbon Monoxide Detector $22.49 Shop Now on Full review →	2 First Alert SMI100-AC Hardwire Smoke Detector $19.67 Shop Now on	Best Overall 3 First Alert Smoke Alarm Battery-Operated $16.99 Shop Now on	⚠ Few Reviews 4 First Alert Smoke & CO Detector 1293$49.00 Shop Now on	⚠ Few Reviews 5 Kidde 20SD10 10-Year Smoke Detector 1923$32.47 Shop Now on	⚠ Few Reviews 6 Kidde 20SD10 Smoke Detector 10-Year Battery 1923$32.47 Shop Now on	⚠ Few Reviews 7 Kidde CO + Gas Detector with Battery Backup 329$57.47 Shop Now on	Best Value 8 Kidde CO Detector AA Battery Powered 982$22.97 Shop Now on	⚠ Few Reviews 9 Kidde CO Detector Plug-in with AA Backup 27168$45.97 Shop Now on	⚠ Few Reviews 10 Kidde Plug-in Carbon Monoxide Detector 795$28.76 Shop Now on
Our Score	9.2 ★★★★★★★★★★ May 2026	9.2 ★★★★★★★★★★ May 2026	9.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026	8.0 ★★★★★★★★★★ May 2026
Customer Reviews	★★★★★★★★★★ 22,815reviews	★★★★★★★★★★ 1,908reviews	★★★★★★★★★★ 4,026reviews	★★★★★★★★★★ 8reviewslimited data	★★★★★★★★★★ 8reviewslimited data	★★★★★★★★★★ 8reviewslimited data	★★★★★★★★★★ 9reviewslimited data	★★★★★★★★★★ 9reviewslimited data	★★★★★★★★★★ 9reviewslimited data	★★★★★★★★★★ 9reviewslimited data
Price	$22.49	$19.67	$16.99	1293$49.00	1923$32.47	1923$32.47	329$57.47	982$22.97	27168$45.97	795$28.76
Best For	Detects carbon monoxide in homes and vehicles	Precision Detection reduces cooking false alarms	Precision Detection reduces cooking false alarms	Advanced sensing reduces cooking false alarms	Detects smoke 25% faster with 85dB alarm	Detects smoke 25% faster than standard models	Plug-in 120V outlet installation in minutes	Electrochemical sensor detects carbon monoxide gas	85 dB alarm alerts to carbon monoxide danger	120V outlet powered with 2-AA battery backup

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