Carbon dioxide sensor principle: using the principle of non- infrared absorption Carbon dioxide measurement range: 400-5000ppm, resolution: 1ppm Carbon dioxide measurement accuracy: 50ppm, or 5% Carbon dioxide detection refresh frequency: 1 second PM2.5 detection range: 0-500g/m3 PM10 detection range: 0-500g/m3 PM2.5/10 sensor principle: The particle dust sensor is a laser principle Temperature measurement range: -20-60; 2 Humidity measurement range: 5%-95%RH;5%RH Operating temperature: -10-50 Operating humidity: 0-95% (non-condensing) Temperature and humidity sensor: dedicated ASIC sensor chip, high-performance semiconductor silicon-based electronic humidity sensor and a standard on-chip temperature sensor Transfer voltage: DC6V-DC36V, or POE power supply Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:White Material:ABS Package Contents: 1 * 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.