Features: 【High Strength Dual Sensors】: Our smoke and carbon monoxide detector is equipped with high value do smoke application and very serious electrochemical CO sensor. Discover this dangerous threat in your home. 【Alarm】: When the smoke or carbon monoxide reaches the level required by the alarm, our detector will emit an audible alarm sound with an intensity exceeding 85 dB and start flashing the red LED. Immediate notification of the need to perform actions to protect yourself and your children. 【Easy Installation and Maintenance】: Our smoke and carbon monoxide detector has been started with installation and maintenance inspection. It has a check function to detect each device and a battery level warning about the need to replace the battery. With a simple and complete design, they blend in perfectly with any room decor. 【LCD display and intelligent functions】: The integrated LCD display shows the smoke and CO function level, contains real-time information. Our smart smoke detector features a test button that activates the electronic power supply, buzzer, and battery. Technical data: Quantity: 1 piece Alarm sound: 85 dB (1 m/39 ft) Sensor Type: Photoelectric Sensor, Electrical CO Sensor Range temperature: 0C49C (32F120F) Humidity: 95% RH (without icing and condensation) Temperature: 5-40 Humidity: 2090% Alarm should be available on the wall. List of things do packing: 1 x Alarm 1 x Manual 1 x install screw package