Combination smoke and carbon monoxide detector, composite alarm with audible warning and battery-powered digital display

This type of smoke and carbon monoxide detector uses electrochemical carbon monoxide sensors, which are the most accurate carbon monoxide sensors currently available. Compared to ordinary electrochemical technology, this latest technology offers greater accuracy, lower power consumption, and a longer lifespan. The battery-powered smoke detector is suitable for indoor locations such as villas, factories, shopping malls, warehouses, office buildings, etc. Features: - New 2-in-1 smoke and carbon monoxide detector. High-precision electrochemical sensor (the most accurate CO sensor). Infrared photoelectric sensor (the best sensor for detecting smoke while minimizing false alarms). - Low power consumption design: After installing 3 AA 1.5V batteries (not included), you will hear a "DI" sound and it will begin working normally after 2 minutes. During operation, it does not display any power-saving indicators. Long standby time and low power consumption. - Loud alarm: Press the test button; the smoke detector and carbon monoxide alarm will be ≥ 85 dB. Whether you're sleeping in the bedroom or watching TV downstairs, the sound will be enough to remind you of the danger. - Easy to install: Drill two marked mounting holes. Use a hammer to drive two plastic eyelets into the holes. Install the bracket to the ceiling by inserting and tightening the provided screws into the plastic eyelets.