20 hours of ultra-long battery life: built-in 1200mAh rechargeable lithium battery, Type-C charging port optimized design, full battery life of 20 hours or more. Equipped with power management function, supports charging. High-precision sensor system with five detection data, visible breathing, power-on detection, detection of indoor CO2, formaldehyde, TVOC and harmful pollution, air hazards have nowhere to hide. Full detection of cold, warm, dry, wet, temperature and humidity, closer to understanding healthy air breathing, real-time detection of temperature and humidity, compensation and calibration of external temperature and humidity interference with detection accuracy Detection parameters: carbon dioxide, formaldehyde, temperature and humidity Other functions: calibration function, screen off function, temperature/Fahrenheit switch, sound Power supply: 1200mah rechargeable battery Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: Black Material: plastic Package Contents: 1 * Air Quality Monitor 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.