Firex Ac

Firex Ac

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Firex 4518 Kidde i12040 Ionization Smoke Alarm 2PACK    US $25.60

Firex 4518 Kidde i12040 Ionization Smoke Alarm w Battery Back Up 6 PACK    US $81.00

Firex 499 Smoke Alarm Accessories Relay NEW    US $18.00

Firex 50004 120V AC With Battery Back up Smoke Alarm    US $19.90

Firex G-18 smoke detectors.?

I have 5 detectors wired together on 3 levels. They are 110V AC operated, but have started to beep once every few minutes as a battery operated unit with a weak battery would do. I have cleaned them but still the same. The house is 15 years old. Do they have a life span?

They need to be replaced about every ten years.