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S11 Standalone Model Wired Smoke Detector for Apartment Conventional Smoke Alarm. EN14604 Certification: Certified by European standard EN14604 for reliable smoke detection. Long Battery Life: Equipped with low-power MCU, battery life lasts over 1 year to 10 years. High Sensitivity Alarm: Audible and visual alarm with sound pressure level >80dB at 3 meters. Smart App Connectivity: Wi-Fi model pushes alarm notifications directly to mobile apps. Low Battery Warning: Automatic low voltage threshold alerts (2.5V or 7.0V) for safety.