Features: Accurate detect : Carbon Dioxide(CO2), Formaldehyde(HCHO), Volatile Organic Compound(TVOC). Those readings involve detection of toluene, harmful chemical substances and pollutants in the air such as carbon dioxide, carbon monoxide,smoke,fog,dust,ink and others. Large screen display makes it easier to read data, convenient and intuitive, clear division, pollution level, and easy operation of buttons. Built-in battery, energy-saving and environmental for protection, long standby for time, 3 hours of charging, continuous use of 180-240 minutes. Easy to carry, suitable for home, car, office, factory and other environment, 24-hour real-time monitoring to protect your and your family's healthy life and safety. Using natural air flow detection technology, more accurate determination of air quality problems. Specifications: Material: ABS Size: 13x7cm/5.12x2.76in Detectable substance: CO, CO2, HCHO, TVOC, AQI Application technology: natural air flow detection technology Display mode: LED digital display Error float: 3%-30% Power on preheating: 120 seconds Working voltage: 5V Battery: 1 x lithium battery, 1000mAh (included) Charging time: about 3 hours Standby time: about 180-240 minutes Package Includes: 1 x Air Quality Detector 1 x Instruction Manual 1 x USB Charging Cable 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.