Features: Accurate Test: It can accurately and quickly monitor the indoor CO2 concentration, thus protecting your for health. It can also test indoor temperature and humidity in real-time. Real-Time: With newest electrochemical sensors for more accurate and rapidly measurement, it can help you get the real-time insight about indoor air quality to help you take some actions. Stable & Durable : Built-in rechargeable battery can monitor the air quality for a long for time continuously. Clear screen display and three-color LED indicator can help you clearly identify the air qual Portable & Lightweight: With 2.76x3.15x1.38 inches size, stylish exterior and durable materials, this air quality meter is compact and very easy to carry and can be used for a long for time. Widely Application: It is for ideal for monitoring air quality in for cars, rooms, schools, office buildings, greenhouses, factories, hotels, hospitals,the places with babies, kids and the places with babies. Specifications: Material: ABS Display method: Common Screen display Atmospheric pressure: 86Kpa - 106Kpa Detection method for CO2 : Infrared (NDIR) Sampling time: 1.5 seconds Product Size: 70x80x35mm/2.76x3.15x1.38 inches Detection temperature: -10°C to 50°C Relative humidity: 20% - 85% Storage temperature: -10°C to 60°C Concentration unit for CO2:PPM Power source: Lithium battery with 1000mAh capacity 5V for DC power charging via micro USB port Product weight: 150g Package Includes: Package includes: 1x Main Unit+ manual+USB charging cable note: Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.