General description This combined smoke and carbon monoxide detector features advanced electrochemical sensors for high accuracy and reliability. It is designed for indoor use in various settings, including villas, factories, shopping malls, warehouses, and office buildings. The device operates on 3 AA 1.5V batteries (not included) and is equipped with a loud alarm to alert users of potential dangers. Technical specifications Type: Combined smoke and carbon monoxide detector Power source: Battery-operated (requires 3 AA 1.5V batteries) Alarm volume: ≥ 85 dB Sensor type: High-precision electrochemical sensor for CO detection and infrared photosensor for smoke detection Installation Drill two marked installation holes in the ceiling. Use a hammer to insert two plastic grommets into the holes. Attach the ceiling mount using the included screws and tighten them securely. Usage Press the "Test" button to check the alarm functionality. Normal operation begins after a 2-minute initialization