Features: Experience precise air quality monitoring with the co2 meter, measure carbon dioxide level, temperature, and humidity simultaneously. This compacts device boasts a colorful digital display that visually indicates co2 concentration changes, charging by a builts in 1200mah battery rechargeable by USB. For family who prioritize maintaining optimally indoor air quality in their homes or offices. Perfect for use in various setting such as kitchens, living room, bedrooms, or even on travel, ensuring you constantly aware of your environment's air quality. With its user friendly interfaces, simply hold the "on off" button for three second to activates automatic co2 detection, making it a essential tool for any modern household. Specifications: Component:ABS Size: Approx.90x70x35mm/3.54x2.76x1.38inch Color:Black/White 1200mAh Voltages: 3.7V Measuring ranges: 400PPM-5000PPM Charge for 2-3 hours, and it can last for 240-360 minutes. Measurement accuracy: 10PPM Package Includes: 1pcs Digital CO2 Meter 1pcs Instructions 1pcs Data Line note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.