This product has a LCD screen to display temperature, humidity and carbon dioxide concentration, as well as low battery reminder, . Flexible Placement: Supports hanging placement and table placement. Standard exceeding Alert: When the concentration of carbon monoxide exceeds 200 , PTH-12 triggers an audible and visual alarm. There are three preset co concentration levels. When co concentration is lower than 100 , the light is green. When co concentration is 100~200 , the light turns yellow. And when the co concentration reaches 200 , the light turns red and the detector sounds loudly. (The alerting value can be set by users). For industrial and domestic use. With clear display, digit, indicator light, buzzer alert, PTH-12 can your security in your work and life. Model Number: PTH-12 CO Measuring Range: 0~500PPM Accuracy: 10ppm Response Time: Less than 60s Temperature Measuring Range: -10C ~ 40C (14 ~ 104) Accuracy: 1C(1.8) Resolution: 1C(1) Humidity Measuring Range:20 ~ 80 % RH. Accuracy: 5 % Resolution: 1% Battery: 2400 mAh Charge Input: 5V/1A type: Air Quality detector color:Black Material:ABS size:83 x 83 x 32mm Package Contents: 1 x Air Quality detector 1 x Charging 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.