Product Details Thank you for purchasing a CO2 monitor! Please read the instructions carefully before using this equipment. This product can detect the concentration of CO2 in the air in real time, and can detect the temperature and relative humidity of the air. The temperature can be displayed in Fahrenheit and Celsius. Please allow the device to work outdoors for a few minutes before use to get the most accurate results. Please keep the manual handy for quick reference and troubleshooting. Precautions Avoid covering the intake area during use to avoid inaccurate measurement. Avoid using solvents to clean the product, because residual smoke can affect air quality readings. Avoid water or other liquids near the product to avoid electrical damage. Unauthorized modification or repair of this product is not allowed. If the battery will not be used for a long time, remove the battery from the device. feature ?CO2 test range 400~5000ppm ?Support Celsius and Fahrenheit switching ?Temperature test range 0 - 55 or 32~131 ?Humidity test range 0~98% ? If the CO2 concentration exceeds 1000PPM, the device will give an alarm and display ?Support USB power supply and AAA battery Product specifications Display mode: LCD CO2 range: 4005000PPM (1PPM±15%) Temperature range: 0 ~ 55°C or 32 ~131°F (±0.1°C or ±0.1°F) Humidity range: 098% (±5%) Sampling time: 1 second Warm-up time: 120 seconds Battery voltage: 2.6~3.3V USB power supply: 4.5 ~ 5.5V Working current: ~55mA Standby current: <2mA Backup power supply: AAA battery X 2pcs Charging: Micro USB interface Product size: 60 x 60 x 25 mm Product weight: 108g The package includes: 1. Host × 1 2. Product holder × 1 3. Instruction Manual × 1 4. USB data cable × 1