Pack of 2 Smoke Detectors: This pack of two Smartwares 10.048.28 smoke detectors provides early warning if a fire starts. Install one on each floor, or in rooms between 20 and 40 m². Compliant with European Safety Standards: These smoke detectors meet all European safety standards, providing reliable fire protection you can count on. High-Sensitivity Photoelectric Sensors: Smartwares smoke detectors are equipped with highly sensitive photoelectric (optical) sensors for early warning, effective even in smouldering fires, while minimizing false alarms. 10-Year Sensor Lifespan and Replaceable Battery: Each smoke detector uses a replaceable 6F22 battery. The optical sensors become obsolete 10 years after activation, so remember to replace the detectors accordingly. Test each detector monthly to ensure proper functionality. Loud 85 dB Alarm with Low Battery Alert: In the event of a fire, an 85 dB siren sounds. The detector also alerts you when the battery needs replacing. A test/silence button allows you to temporarily silence the alarm if a false alarm occurs., Weight: 0.573201875 pounds, Manufacturer: Smartwares