Smoke and CO detectors that connect to your phone
Alerts to your phone help most when you are not on site.
Rules first
Many places set legal requirements for detectors in rentals. Check your local rules and the standards a detector must meet before you buy.
Smart features worth having
Phone alerts, a loud local alarm that works without Wi-Fi, a long-life battery and a clear end-of-life warning. Test every detector between stays.
Product picks follow after hands-on research.