Make your life safer – This smoke detector with a 3V lithium battery features a photoelectric sensor optimized to detect even slow smoldering fires. The detector also has a loud 85 dB alarm, an easy mounting bracket, a test/silence button, and a signal indicating the end of battery life, so you know when to replace the battery. For maximum protection and the highest safety, you can rely on the LogiLink smoke detector when it comes to saving what matters most in life.