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Smoke detectors are used to effectively alarm people in a building where a fire has broken out. This allows the fire to be extinguished in its initial phase and the rooms at risk to be safely evacuated. The CDB-02 detector is characterized by a built-in lithium battery that lasts the entire life of the detector (10 years), so the user does not have to periodically replace the batteries in the device. An additional advantage is its very small, compact dimensions (diameter only 50mm).