STAY ALERT TO FIRE HAZARDS: this pack of 4 Smartwares 10.100.41 smoke detectors keeps you alerted to any fire outbreaks, Install one on each floor, ensuring you can hear the alarm throughout the house. MEETS EUROPEAN SAFETY STANDARDS: these smoke detectors comply with all European safety standards, They need replacement after 10 years from installation, Test their function monthly using the test button. HIGH-SENSITIVITY PHOTOELECTRIC SENSORS: each Smartwares smoke detector features highly sensitive photoelectric (optical) sensors, offering early warnings and effective detection, even in smouldering fires, with fewer false alarms. REPLACEABLE BATTERY WITH LOW-BATTERY INDICATOR: each smoke detector uses a replaceable 6F22 battery, with an indicator that alerts you when the battery is low. LOUD 85 DB ALARM WITH SILENCE FUNCTION: when a fire is detected, an 85 dB alarm sounds, A test/silence button allows you to temporarily silence the alarm in case of a false alarm., Weight: 1.1464038 pounds, Manufacturer: Smartwares