Specification: Material: ABS+PC Size: 3.15*2.08*0.71inch Battery capacity: 1200MAH Use time About: 24 Hours Charging Method: USB DC 5V 0.5A Refresh Rate: 2s Temperature Range: -10-50 Humidity Range: 0-90%RH CO2 Range: 400-5000PPM Feature: This 3 in 1 CO2 monitor can detect real-time CO2 concentration, monitor indoor and outdoor humidity, and temperature. CO2 detection range: 400-5000PPM. Temperature detection range: 0-50. Humidity detection range: 0-99%RH. The Air Quality Monitor is small and portable, easy to carry around as a decoration, you can check air quality anywhere and anytime. With Intelligent early warning system, high quality infrared NDIR sensor, multiple interference prevention. The CO2 detector has a built-in large capacity rechargeable battery, charging takes only 2.5 hours, and standby up to 30hours. You can check the air quality from anywhere, or have the device continuously monitor at a specific location. With full-color display and LCD screen design, this carbon dioxide detector is super easy to read. Digital display with intelligent backlight, eye protection function, one key operation. Suitable for home, school, office, travel, indoor&outdoor, agricultural planting, production warehouse, and other occasions. We offer 3 months free return and lifetime warranty for our mini CO2 detector. Package Included: 1x CO2 Detector