High accuracy and high stable carbon dioxide monitor for real time detecting CO2 concentration, temperature, humidity, also display current time and date, really multifunctional and practical to get one. Features: 3-inch HD Large LCD Screen Display: simultaneously display CO2 concentration, temperature and humidity, date and time. Audio and Visual Alarm: the CO2 data will upgrade every 3 seconds, once it exceed 1000ppm, it will make sounds and the backlight will turn red. Air Quality is Indicated with Emoticons: according to the CO2 concentration, there are 6 kind of emotion icons to indicate the current air quality. NDIR Infrared Sensor Adopted: professional non-dispersive infrared(NDIR) provide fast and high accuracy measurement results. Rechargeable Battery Power Supply: 1500mAh great capability 3.7V polymer lithium battery, and built-in with power protection chip to ensure security. Automatic and Manual Calibration Function: perfect for various working environments and conditions. Wide Applications: can be used in homes, shopping malls, offices, vehicles, stations, laboratory, cleanroom, greenhouse, CO2 storage room, and more. Specifications: Material: ABS CO2 Range: 400~5000ppm CO2 Resolution: 1ppm CO2 Accuracy: ±(5%rdg+50ppm) (at normal temp.&humidity, 400~2000ppm) Temperature Range: -10~50 Temperature Resolution: ±1 Temperature Accuracy: ±1 Humidity Range: 0%~99%RH Humidity Resolution: 1%RH Humidity Accuracy: ±5%RH at 25 (10%~99%RH) Working Environment: 0~50, 0%~85%RH Storage Environment: -20~60, 0%~95%RH Sensor: NDIR CO2 sensor Respond Time: <2 minutes ABC: Automatic baseline calibration Power Supply: 3.7V 1500mAh rechargeable battery or USB power supply Screen Size: 76.3 * 25.4mm / 3.00 * 1.00in Item Size: 130 * 75 * 55mm / 5.12 * 2.95 * 2.17in Item Weight: 195g / 6.88oz Packing List: 1 * CO2 Monitor 1 * USB Cable