Are smoke alarms expensive?

Smoke alarms are not expensive and are worth the lives they can help save. Ionization and photoelectric smoke alarms cost between $6 and $20. Dual sensor smoke alarms cost between $24 and $40.



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1. Why should I have a working smoke alarm?
2. What types of smoke alarms are available?
3. What powers a smoke alarm?
4. Are smoke alarms expensive?