General description This Gas Detector Carbon Monoxide Smoke Detector Combination is a battery-operated CO and smoke alarm designed for accurate detection of harmful gases. It features an advanced electrochemical carbon monoxide sensor and a photoelectric sensor, ensuring reliable performance. The device alerts users with a loud alarm and LED flashes when dangerous levels of smoke or carbon monoxide are detected. Technical specifications Color: White Material: ABS Detection Gas Type: CO, Smoke Alarm Mode: Flash + Loud Alarm Sound CO Sensor Type: Electrochemical Working Temperature: -10~60°C Relative Humidity: 10~95% RH CO Sensitivity: 000-999 PPM Alarm Sound: ≥75 dB (1 meter) Alarm Concentration: 50 ppm (screen lights up), 150 ppm (human voice alarm) Power Supply: DC 3V, 2 * AAA batteries (not included) Product Size: 6 * 6 * 2.5 cm / 2.3 * 2.3 * 0.98 inch Product Weight: 70 g / 2.4 oz Installation The detector is easy to install and comes with a bag of screws, allowing you to mount it