Features: It's easy to carry the intelligent air quality monitor that can help us detect the gas air pollution in household, kitchen, bedroom, office etc...especially in which has baby,child and pregnant woman. Indoor air quality monitor built in electrical sensors that can accurate detect air containing For-malde-hyde(HCHO), Vo-latile Or-ganic Com-pound(TVOC), PM2.5 & PM10. Just press the power on / off button 3 seconds, you can easily operate this air monitor, designed with LED digital display, can provide the average value of each gas, real-time detection of harmful HC-HO and TV-OC in the room . The air quality monitor is equipped with a USB charging cable and built-in 1200mAh 3.7V rechargeable battery. Themeasured data can only be used as a reference for the change of househod air environment. Compliance with Test Range Standard,Compliance with CE Standard and Compliance with ROHS Standard. Specifications: Material: Plastic Size: 11.8x7x3.4 for cm/ 4.65x2.76x1.34 in Product Model : HLW-100 Display Mode:LCD Color Screen Digital Display Error Floatin:3%-30% Product Specification : 120mm×72mm×34mm Working Voltage:5V Boot Preheating:120S (only.formaldehyde TVOC senson) Battery Capacity:1200mA Chaging for Time : About 4h Standby Time:About 240-360 min Package Includes: 1 X Air Quality Tester 1 X USB Cable 1 X User Manual 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.