This product is an air quality monitor that detects Carbon dioxide (CO2),Particulate Matter (PM2.5),Temperature and Humidity. it combines sensors real-time monitoring of Carbon dioxide (CO2), PM2.5,temperature and humidity on its display Support est variables:Carbon dioxide(CO2),PM2.5, emperature and umidity -Support CO2 exceeding alarm -CO2 alarm threshold can be set [Large Screen] The large screen displays the battery level, which is clear and easy to read, and the measurement results are accurate. Multifunctional] Using empty semiconductor TVOC sensor, which can measure CO2, temperature and humidity, to meet your need.Welcome inquiries [Widely Application] Carbon dioxide detector is widely used in a of situations, such as offices, bedrooms, living rooms, gymnasiums, etc. The product contains a built-in lithium battery, which is rechargeable Colour:White Material:ABS Size:267x140x30 mm Package Contents: 1x Carbon dioxide detector 1x Positioning sticker 1x USB cable 2x Screw 2x Rubber stopper 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.