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Non-Addressable 24V 2-Wire Smoke Detector for Fire Alarm System. Non-Polarity 2-Wire Design: Adopts non-polar signal two-bus communication mode for easy wiring. Photoelectric Detection: Uses photoelectric smoke detection technology for accurate monitoring. Wide Voltage Range: Supports work voltage from DC12V to DC24V with nominal DC 24V. OEM & ODM Service: Provides customization services for product design and manufacturing. Fast Lead Time: Normal lead time is 15 working days for both peak and off seasons. 1 Year Warranty: Comprehensive 1-year warranty coverage for product quality assurance. LED Status Indication: Red LED flashes slowly for monitor status and stays on for alarm.