【2 In 1 Protectio】Home Alarm has two built-in sensors that display smoke and carbon monoxide (CO) concentrations on a large LCD screen. This prevents being affected by the concentration of carbon monoxide and smoke in the surrounding air. Reminder: During the test, put the alarm in a sealed bag and test it with an appropriate amount of carbon monoxide and smoke. 【Super Alert】When the carbon monoxide content exceeds 300 ppm, an alarm sounds, the red light flashes and the buzzer sounds every 5 seconds. The valve should be immediately closed and doors and windows opened to allow indoor air to circulate. If a smoke concentration greater than 0.1% db/m is detected, an alarm sounds, the blue light flashes, and the buzzer always sounds an alarm volume greater than 85 dB. 【Sensitive and Fast】Carbon Monoxide Smoke Detector Equipped with an electrochemical CO sensor and an advanced smoke sensor for accurate detection of hazardous levels of carbon monoxide and smoke, if the detected