My smoke alarm beeps. What is wrong with it?

 The problem is usually a weak or improper battery.  Replace with a fresh battery as recommended by the manufacturer.

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1. My smoke alarm goes off a lot. What is wrong with it?
2. My smoke alarm beeps. What is wrong with it?
3. Are any smoke alarms not recommended?
4. What kind of smoke alarm should I buy?
5. Where should I install the smoke alarm?
6. my landlord refuses to install a smoke alarm in my apartment. Who is responsible?