Monitor indoor air quality with our Indoor CO2 Detector. Equipped with a high precision sensor for accurate readings, it features sound and light alarms for alerts. Charge for 2-3 hours and enjoy 4-6 hours of continuous use Product Model: Air Quality Detector Operating temperature: 0-70 Display mode: TFT full color screen Working voltage: 5V Sensor:PM2.5 sensor or semiconductor sensor or electrochemical sensor Battery:1200mAh Voltage:3.7V Charge 2-3 hours, available 4-6 hours Detection range: PM2.5: 0-999ug or m PM10: 0-999ug or m Formaldehyde: 0-9.999mg or m Organic Pollutants: 0-9.999mg or m Carbon Monoxide: 0-1000PPM Carbon dioxide: 0-5000PPM Temperature: 0-70 Humidity: 0-99percent RH Air: 0-500 Operating Instructions: (1) Long to turn on or off (2) Click 1 time to turn on or off the buzzer (3) Click 2 times to change the temperature unit or C (4) Click 3 times to enter the menubar after entering the menubar: click 1 time to select item, click 2 times to confirm, click 3 times to exit. (5) After entering the curve interface: click 2 times to enter the main interface, click 3 times to enter the menus interface. (6) After entering the calibration interface: calibrate the sensor parameters and exit automatically after 5 seconds. (If the parameter is abnormal, you can calibrate the sensor by this method.) Colour:A:Black Material:ABS Size:90x35x70mm Package Contents: 1 x Air Quality Detector 1 x Instructions in Chinese and English 1 x Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.