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AS-SHD331 9V Battery Smoke Cum Heat Detector. Dual Detection Technology: Combines photoelectric smoke and heat sensing for comprehensive fire protection. High Decibel Alarm: Delivers a loud 85dB alarm to ensure effective warning in emergency situations. Optional Wireless Output: Supports 315MHz or 433MHz wireless transmission for integration with alarm systems. Easy Ceiling Installation: Designed for simple ceiling mounting with a compact size of 106mm x 59mm. ISO 9001 Certified: Manufactured by an ISO 9001:2008 certified facility with rigorous quality control. 12-Month Warranty: Includes a 12-month warranty covering replacement or repair for quality defects.