Features: 1Carbon dioxide detector with high accuracy and stable performance, short response time. 23.2?inch full color TFT display, can show date, time, CO2, humidity, temperature (/H switchable) and other information. 3Professional grade detection technology, built?in sensor, support real time CO2 monitoring. 4The detector will alarm you once the CO2 is exceed the setting value to ensure your safety. 5Store up to 999 sets of data and have historical data trend charts for you to view. 6Comes with rechargeable lithium battery, also can be powered by 5V USB cable. Compact size with portable storage box, easy to operate and carry. Item Type: CO2 Detector Material: ABS Plastic Input: (USB) 5V, 2A Measuring Range: 0-9999PPM Resolution: 1PPM Accuracy: 40PPMRdg10% Temperature Measurement Range: -10-60 (-14-140H) Temperature Measurement Accuracy: 1 (2H) Temperature Resolution: 0.01/H Humidity Measurement Range: 0-100%RH Humidity Measurement Accuracy: 3%RH (20-80%RH) Humidity Resolution: 0.01%RH Operating Temperature Range -10-60 (-14-140H) Working Humidity Range: 0-99%RH Storage Temperature Range: -40-80 (-40-176H) Working Current: 90-300mA Charging Time: 3 Hours Power Supply: 1Pc 3.7V, 2600mAh 18650 Rechargeable Lithium Ion Battery/Powered By 5V USB Cable Record Group: 999 Set 1 xDetector 1 x Data Cable 1 x Bracket 1 x Manual 1 x Tool Box