How much do they cost?

Smoke alarms are fairly inexpensive and reasonably priced. 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 do I need a smoke alarm?
2. How do they work?
3. Where in my home should I install them?
4. What powers a smoke alarm?
5. How much do they cost?
6. Where can I purchase them?