This product has a LCD screen to display temperature, humidity and carbon dioxide concentration, as 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-12CO Measuring Range: 0~500PPMAccuracy: 10ppmResponse Time: Less than 60sTemperature 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 mAhCharge Input: 5V/1Atype: Air Quality detectorcolor:BlackMaterial:ABSsize:83 x 83 x 32mmPackage Contents:1 x Air Quality detector1 x Charging CableOnly 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.