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Assuming this is a question about a smoke detector:

1.The sensor can be obscured with dirt and/or dust

2. An insect such as a spider may have be obscuring the sensor. Sometimes you will even find a web inside the detector.

3. The detector may be defective.

4. The battery, even though it has been changed, may provide too low a voltage to the device. Make sure the battery itself is OK.

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Q: What would make the detector still beep after the battery is changed?
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