9v battery for smoke detector

First Alert CO605 Plug-in Carbon Monoxide Detector with Battery Backup: 9-Volt Alkaline, No Hardwired Installation Needed

Energizer Ultimate Child Shield 4pk lithium CR2025 Battery

Energizer MAX 32pk Alkaline AAA Battery

First Alert® SMICO100 Battery-Operated 2-in-1 Smoke and CO Alarm, Ionization

MEDca 1.5V Alkaline Batteries – LR44 AG13 357 303 SR44 Button Coin Cells for Hearing Aids, Toys, Remotes, Calculators, Long-Lasting & Anti-Corrosion

First Alert CO710 Carbon Monoxide Detector with Digital Temperature Display: 10-Year Warranty, Lithium Battery, White

First Alert SM100V-AC, Interconnect Hardwire Smoke Alarm with Battery Backup & Voice Alerts, 1-Pack

First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup

First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

Kidde Hardwired Smoke and Carbon Monoxide Detector with 10-Year Battery Back-up 30CUA10

Levoit Core 300 Air Purifier White

First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack

Kidde AA Battery Powered Smoke and Carbon Monoxide Detector 30CUDR

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup

Personal Fan - Dealworthy™

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 3-Pack