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S11 Zigbee Model Wired Smoke Detector for Apartment Conventional Smoke Alarm. Long Battery Life: Battery life lasts over 1 year to 10 years depending on the model. Audible & Visual Alarm: Triggers loud sound >80dB and red LED light upon smoke detection. Smart App Notification: PA-443 model pushes alarm notifications directly to mobile apps via Wi-Fi. European Standard Certified: PA-443 model certified by European standard EN14604 for safety. Multiple Power Options: Supports DC 3V AA batteries, 3V CR123A, or 9V alkaline batteries.