Dear Customers,please read the following detailed patiently before you purchase the product. If you want the videos and manuals, please contact us , thank you Consideration Please read the instructions carefully before using this device. Please let the device work short mins outdoors before use for most accurate results . Please keep the manual handy for quick reference and troubleshooting. Precautions Avoid covering the air intake areas during use to avoid inaccurate measurements. Avoid use of solvents to clean the product as residual fumes will skew air quality readings. Avoid water or other liquids near the product to avoid electrical damage. Do not allow unauthorized modification or repair of this product. DM125-wifi & no wifi > Product This product is an air quality monitor that detects Carbondioxide (CO2),Particulate Matter Specifications: Display method:3.5 inch LCD display Atmospheric preure: 86Kpa - 106Kpa Detection method for CO2 : Infrared (NDIR) Detection method for PM: laser scattering Sampling time: 1.5 seconds Product Size: 150*74*82 mm Detection temperature: -10C to 50C; Relative humidity: 20% - 85% Storage temperature: -10C to 60C; Concentration unit for CO2:PPM Concentration unit for PM: ug/m3 Power source: Lithium battery with 3000mAh capacity; 5V DC power charging via micro USB port Product weight: 190g DM125C > Product This product is an air quality monitor that detects Carbondioxide (CO2),Temperature, and Humidity. it combines sensors real-time monitoring of Carbon dioxide (CO2),temperature, and humidity on its display > Specifications: Display method: 3.5 inch LCD display Atmospheric preure: 86Kpa - 106Kpa Detection method for CO2 : Infrared (NDIR) Sampling time: 1.5 seconds Product Size: 150*74*82 mm Detection temperature: -10C to 50C; Relative humidity: 20% - 85% Storage temperature: -10C to 60C; Concentration unit for CO2:PPM Power source: Lithium battery with 2000mAh capacity; 5V DC power charging via micro USB port Product weight: 190g When you place an order, please choose a shipping way and pay for the order including the shipping cost. We will send the items as soon as poible. We do not guarantee delivery time on all international shipments due to differences in customs clearing times in individual countries, which may affect the time you get the parcel. Please note that buyers are responsible for all additional customs fees, brokerage feeds, duties, and taxes for importation into your country. These additional fees may be collected at time of delivery. We will not refund shipping charges for refused shipments. The shipping cost does not include any import taxes, and buyers are responsible for customs duties.