Why do I need a smoke alarm?

Buy a smoke alarm at any hardware or discount store. It’s inexpensive protection for you and your family. Install a smoke alarm on every level of your home. A working smoke alarm can double your chances of survival. Test it monthly, keep it free of dust and replace the battery every 6 months. Smoke alarms themselves should be replaced after ten years of service, or as recommended by the manufacturer.

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1. Why do I need a smoke alarm?
2. What does it mean when my smoke alarm chirps?