Small Air Quality Analyzer with LED Digital Display LCD Screen Small Portable Air Quality Detector Home Office OOTDTY Features: 1200mA large capacity battery, type-C charging interface, standby time is 240-360 minutes. Infrared optical detection technology, more accurate and high precision you could get. It detects all day and care for the health of your family. It can overcome the influence of temperature difference on detection accuracy. Two power supply modes: battery and USB two ways to supply the power. easy to use and very fast. l Specification: Color: White/ Black Size: 90mm/3.5 in x 70mm/ 2.8 in x40mm/1.6 in Temperature: 1-70 Display Model: LED+LCD+Backlight Voltage5V Battery Capacity: 1200HMA CO2 Instructions: 0-799ppm: Green flashing 800-1199ppm: Yellow Flashing 1200-1599ppm: Orange Flashing 1600-1999PPM: RED Flashing Package Includes: Type 1: 1 x White Air Quality Detector with Battery Type 2: 1 x Black Air Quality Detector with Battery note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.