The HM-638PHS Smoke Alarm is a high-performance fire safety device designed for residential and commercial applications. Certified to UL217 and CAN/ULC S531 standards, it ensures reliable smoke detection and compliance with North American regulations.

Featuring advanced dual infrared light detection technology, the device improves detection accuracy while reducing false alarms. The built-in 10-year sealed battery eliminates the need for replacement, providing long-term, maintenance-free operation.

With a loud alarm output of ≥85dB at 3 meters and a 12-hour alarm memory function, users can stay informed of past alarm events. Additional features such as low power consumption and a hush mode enhance user convenience.

Manufactured under strict quality control standards, the HM-638PHS supports OEM/ODM customization, making it an ideal choice for global distributors and project-based buyers.

Power：DC3V

Product Life：10 years

Battery Life：10 years(Battery not replaceable)

Alarm Indication：Red LED flashes,alam sound≥85 dB at 10ft

Working Temperature：40°F(4.4°℃)to 100°F(37.8°℃)

Working Humidity：≤95%RH(no condensation)

Dimensions：L124.8mmxW124.8mmxH37mm

Heiman is a professional manufacturer specializing in fire safety alarms and smart home sensors, with over 21 years of industry experience. Founded in Shenzhen, China, the company operates a dual manufacturing base in Shenzhen and Vietnam, with an annual production capacity of 15 million units. Heiman owns a CNAS ISO7025 accredited laboratory and an Intertek/ETL recognized satellite lab, ensuring strict quality testing and compliance. With over 1,000 patents and certifications, the company serves customers in more than 100 countries worldwide. Heiman provides one-stop OEM/ODM solutions, including industrial design, hardware and software development, cloud integration, and technical support, making it a reliable partner for global distributors and brands.