Feature: 1. Efficient Detection: Equipped with powerful smoke leak detection capabilities, ensuring home safety and to prevent potential hazards. 2. Alarm Reminder: The alarm is equipped with an sound and light alarm device. Once smoke leakage is detected, it immediately emits warning alerts. 3. Multifunction Design: Integrated carbonizing gas and smoke detection , providing dual protection for home safety, reliable and practical. 4. High Sensitivity: Smoke sensor is highly sensitive and can quickly and accurately detect the presence of these dangerous gases in the environment. 5. Practical Tool: The detection device is designed for easy installation and operation. It can be easily mounted on the wall or ceiling. Specification: Item Type: Smoke DetectorMaterial: ABSBattery Type: Lithium battery Battery type: 1.5VAAx3 (Shipped without batteries) Static Current: <160uA Alarm Current: <20mA Alarm Sound: Sound and light prompt Operating Temperature: 0-50C Operating Humidity: 10%-95% relative humidity Gas Detection Concentration Smoke Sensitivity: 000-999 PPM/0.1%db/m-9.9%%db/m. Package List: 1 x Smoke Detector2 x Screws2 x Expansion Screw1 x English User Manual