First Alert 10-Year Battery Photoelectric Smoke Alarm, Slim Profile vs First Alert SM210 / SM210V / SM210L 10-Year Smoke

Side-by-side specs from each maker.

Only the differences are shown.

First Alert 10-Year Battery Photoelectric Smoke Alarm, Slim ProfileFirst Alert SM210 / SM210V / SM210L 10-Year Smoke
TypeSmoke or CO alarmSmoke or CO alarm
Alarmsmokesmoke
Sensorphotoelectricphotoelectric
Power10-year sealed lithium battery10-year battery (lithium metal, not replaceable)
Standards (maker)Not listedConforms to UL 217 10th Edition Standard
Replace afterNot listed10 years

First Alert 10-Year Battery Photoelectric Smoke Alarm, Slim Profile

A slim photoelectric smoke alarm with a built-in 10-year lithium battery that mounts on a wall or ceiling with a twist-lock bracket.

  • Photoelectric sensor
  • No battery changes
  • Half as thick as a standard alarm

First Alert SM210 / SM210V / SM210L 10-Year Smoke

A photoelectric smoke alarm with a sealed 10-year lithium battery and a slim profile. Voice and path-light versions are separate models from the same maker.

  • Sealed 10-year battery
  • UL 217 10th edition
  • The maker lists a lifespan of about 10 years
  • Smoke only, no CO sensing