Set of 3 smoke detectors with battery (3 pcs) -

【10-Year Battery Life Smoke Detector】: The Smart Fire Alarm and photoelectric sensor with a built-in lithium-ion battery features ultra-low power consumption components, reducing operating costs and extending battery life up to 10 years. Therefore, the smoke detector can remain operational for 10 years, ensuring uninterrupted 24/7 protection. Save effort and monitoring costs. 【Smart Chipset and Latest Photoelectric Sensor】: The latest photoelectric sensor can detect smoldering and open fires at an early stage. When smoke enters the smoke detector, the smart chipset can immediately detect it and analyze it three times within seconds to determine if it is caused by a fire or cooking. Smoke Detector 【Large Test/Mute Button Design】: The test/mute button is so large that the Smart Fire Alarm and photoelectric sensor can be operated from the ground without a ladder. A broom handle or umbrella is all you need to press the test button. The test function button allows you to regularly test the alarm and easily disable it when false alarms occur. 【Reliable Self-Monitoring】: This photoelectric fire alarm has a self-monitoring function. The fire detector with photoelectric sensor continuously monitors itself and promptly alerts you to errors and low battery levels.