The Kidde Smart Smoke Alarm with Ring ($54.97) and the Kidde Smart Smoke and CO Alarm with Ring ($74.97) are hardwired alarms ...

These employ both technologies — ionization and photoelectric — in one device. All three types of smoke alarms come in battery, hard-wired and smart versions. Each offers different advantages.

Photoelectric detectors respond more quickly to smoldering ... adding that many new homes require hardwired smoke detectors. Smoke detectors that last 10 years may be a great option if you don ...

Multiple units are capable of connecting to one another without the use of a hardwired ... a smoke alarm much easier because they’ve essentially eliminated the distinction between photoelectric ...