LED screen display infrared Sensor infrared (NDIR) Temperature display: C CO2 detection range: 400-5000 ppm Carbon dioxide exceeding the alarm value: 1000ppm The alarm value can be manually adjusted in the range of 800-2000ppm The unit increases by 100ppm The alarm function can be turned on and off by manual operation. Power supply: Built-in battery 2000 mah Colour:black Material:ABS Size:about 130 x 63 x 33mm Package Contents: 1X host 1X USB charging cable 1X English manual 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.