The battery-operated FireAngel smoke detector FA-6120-INT can be installed quickly and conveniently. The installation materials for the optical smoke detector are included in the package. Under normal operating conditions, the smoke detector is functional for 10 years. You should replace the smoke detector after this period to ensure continuous protection for your home. Additionally, the detector can be mounted on the mounting plate of the FireAngel ST-622-DE P-Line, ST-630-DE P-Line, and ST-632-DE P-Line, making it easy to replace with this detector.