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AS-SSD331 9V Battery Operated Smoke Alarm Detector. Photoelectric Detection: Uses photoelectric smoke style with high stability optical smoke chamber. Wide Detection Area: Effective detecting area ranges from 40 to 60 square meters. Optional Wireless Output: Supports 315MHz or 433MHz wireless output for integration. 85dB Alarm Decibel: Provides loud 85dB audible alarm for effective fire warning. Dual LED Indicator: Equipped with two LEDs for clear visual status indication. Built-in Test Button: Features a test button for easy functionality verification. ISO 9001 Certified: Manufacturer is ISO 9001:2008 certified with third-party certificates.