Material:ABS Product size70*80*35MM LED screen display CO2 technology: infrared ( NDIR) Celsius temperature unit CO2 detection range: 400-5000 ppm CO2 alarm value: 1000ppm CO2 alarm on/off function (if users don't like the alarm, people can turn it off by pressing the power button 2 times) Power supply: 1600 mAh rechargeable Li battery with USB charging cable. Included: main unit + manual + charging cable Advantage:< /b> Integrated detection with CO2/Temperature/Humidity Automatic calibration Alarm overshoot with auto-detection and auto-measurement li> The alarm sound can be turned on/off by hand Mini size, very smart, save transportation costs. The brightness of the screen can be adjusted by hand Color changes for different Co2 values Package details Product N.W.150g Product G.W.250g Package dimensions: 11.4 x 10.4 x 6.7 cm. packing list: 1 * CO2 detector Good quality product