1. To the accuracy of detection, let the equipment stand for 10 minutes. If you need to work in a confined space. For automatic calibration, it should be placed in a ventilated environment for 24 hours. You can also choose the hand Dynamic calibration. To the service life of the product, please do not place the product on the ring with poor air quality for a long time In the environment. 2. Do not place the product in extreme environments such as high or low temperature. This product is not protected against- and rain. Please use it under normal environment. Knocking, striking or disassembling the product may lead to inaccurate detection. Please keep it properly. 3. Please keep this product out of reach of children and infants. Do not disassemble, modify or heat this product. Avoid falling or heavy hitting. The product is NOT waterproof, please do not let the product close to the water source, and do not touch the product with wet hands. Metal objects (such as pins and keys) are not allowed to contact terminals or plugs. 4. Do not cut, damage or modify the power cord. The electronic products used in the vehicle are not equipped with rechargeable batteries. The PT04 purchased for outdoor camping is equipped with lithium battery. When it is used in the car, you MUST leave the car with Take . When there is in the car, the maximum temperature in the car can reach 90 in summer. The risk of lithium battery explosion may cause irreparable losses. 5. Intended use:Detection and digital real-time monitoring: carbon dioxide, carbon monoxide, atmospheric pressure, temperature and humidity Product name:Tuya Intelligent air quality monitor Detection gas:CO2, CO, air pressure, humidity and temperature APP:Smartlife/Tuya Connection:Bluetooth Sensor type:NDIR Co sensor and stable electrochemical COsensor Measuring range accuracy of measuring object: Carbon dioxide 400-5000PPM 50ppm or 5% of reading Carbon monoxide 0-1000ppm 5% or 10PPM Atmospheric pressure 300-1100hPa Measuring range:- relative accuracy(950-1050hPa@25 ):0.12hPa Precision:- Absolute precision(950-1050hPa@0- C1140):1hPa Temperature measurement range:- 20-60 Accuracy: 2 Humidity measurement range:5%-95% RH Accuracy: 5% RH CO sensor:stable electrochemical CO sensor Co2 sensor:NDIR Co2 sensor Co2 sensor resolution:1PPM Resolution of CO sensor:0.5 PPM Operating temperature:0-50 Operating humidity:0-95% (non condensing) Sound level 85dB (3Meter) Repeatability:2% Reply time:Less than 60S Battery capacity:3200mA CO alarm setting 1. The screen flashes 10 times when CO value is 9ppm. 2. When CO value exceeds 25ppm, the buzzer will alarm for 6 minutes. Input voltage:DC 5V/2A Power Supply:Rechargeable battery Battery life:24-48 hours. Colour:Silver Material:Plastic Size:11x9x4cm Package Contents: 1 * Carbon dioxide detector 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.