SITERWELL Smoke Detector 9V Battery Operated with Photoelectric Sensor & Low-Battery Warning, Easy to Install Fire Detectors, UL217 10th Edition

• 【UL217-10th Certified】The GS509A photoelectric smoke detector meets UL217-10th Edition standards. Its advanced sensor is highly sensitive to slow-smoldering fires—giving you early detection when every second counts.
• 【10-Year Product Lifespan】Engineered for 10-year long-term reliability, this battery-powered smoke alarm operates on a standard 9V battery with a 1-year replacement cycle. No frequent battery changes or complicated maintenance—one simple setup brings continuous home fire safety.
• 【Smart MCU Design】Built with a precision photoelectric chamber, high-sensitivity IR LED and photodiode, this battery fire alarm delivers fast smoke response. The intelligent MCU microprocessor supports automatic sensitivity calibration and compensation, maintaining stable detection performance even after years of use.
• 【85dB Loud Alarm & Multi Safety Protections】Emits an >85dB(A) loud alarm at 3 meters, loud enough to alert you through large rooms or wake deep sleepers. Features low battery reminder, convenient hush function for false alarms, and fault code warning to ensure you’re always aware of its working status.
• 【Easy Installation】This battery-operated alarm mounts easily on any wall or ceiling. The upgraded magnetic design provides a secure fit—no drilling, no mess, no hassle. Ideal for houses, apartments, senior-friendly homes, and rentals

Specifications

• Power Source: Battery Powered
• Color: White
• Product Dimensions: 3.93"D x 3.93"W x 1.37"H
• Alarm: Audible
• Operating Humidity: 10~95% RH non-condensing
• Upper Temperature Rating: 100 °F
• Material: ABS
• Number of Items: 1
• Built-In Media: Install Accessories, battery, smoke alarm
• Item Type Name: Smoke Detector
• Item Dimensions D x W x H: 3.93"D x 3.93"W x 1.37"H
• Enclosure Material: ABS