SincereetaliFeatures: 5 in 1 monitoring: including CO2/TVOC/HCHO/temperature/humidity monitoring. With different colors on the digital LED screen to indicate whether the current value is safe (safety/warning/exceeding the standard). High-performance chip: accurately capture the small current generated in the electrochemical reaction process and calculate the measurement results, improving the conversion and improving the output efficiency and intelligent energy saving and increasing the service life. Multiple anti-interference: Based on air convection technology, it adopts scientific multi-angle vent design to achieve rapid heat dissipation and more accurate monitoring. Sound and Light Alarm: When the CO2/TVOC/HCHO values exceed the standard, the intelligent sound and light alarm will start automatically. Environmental Protection and Energy Saving: With built-in 1200mAh lithium battery, it can be charged via USB cable to achieve 10 hours of standby time and low power prompt function. Wide Application: Real-time monitoring, suitable for new car, new house, baby room, children's room, living room, bedroom, school, office, hotel, etc. Specifications: Material: ABS + electronic components Color: White Power Supply: 1 * 3.7V 1200mAh lithium battery Charging interface: Type-C interface Charging voltage: 5?V Standby time: 10h Measuring range: CO2: 350~2000ppm TVOC: 0.000~2000mg/m3 HCHO: 0.000~1000MG/m3 Temperature: 0~90? Humidity: 0~99%RH Item size: Approx. 6.7*3.2*9.8cm/2.64*1.26*3.86in Item weight: Approx. 141g/4.97oz Package size: Approx. 7*4*10cm/2.76*1.57*3.94in Package Weight: Approx. 220g/7.76oz Package List: 1 * Digital Tester 1 * USB Cable 1 * User Manual(English)