The portable 3-in-1 carbon monoxide detector can monitor the current CO concentration, temperature and humidity in the air in real time. Equipped with high-precision sensors, the detectable carbon monoxide concentration range is 0-500PPM, the temperature range is -20-60(2), and the humidity range is 5%-95% (5 %RH). The carbon monoxide alarm can display 4-level light indications according to the CO concentration in the air. 0-75ppm (green area safe), 76-125ppm (yellow area improvement), 126-149ppm (oranger area warning),150-500ppm (red area danger). Built-in 1200mAh lithium battery, power supply. Support QC2.0, PD3.0, USB-C and other common fast charging charging. Colour:Black Material:ABS Package Contents: 1 x Air Quality Detector 1 x Cable 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.