Description Function: 1. 1 SECOND UPDATE: The air quality monitor can update the system within 1 second in real time and can directly detect air quality without calibration 2. ACCURTAE DETECTION: High performance analytical chip is used do accurately capture the weak current generated by the electrochemical reaction process of the CO2 detector for more accurate detection 3. BATTERY LIFE: The CO2 detector is equipped with a high capacity 3,7V 1200mAh lithium battery, and the standby time is about 240 do 360 minutes 4. MULTIPLE USES: 5-in-1 meter can detect carbon dioxide concentration in air and HCHO, TVOC, Temp, Humi 5. ABS SCRATCH RESISTANT: The air quality meter adopts excellent ABS material, has impact resistance, scratch resistance, is environmentally friendly Specification: Item Type: CO2 Detector Product Material: ABS Product Weight: 106 g / 3,7 oz (Approximate) Product Size: approx. 9 x 3,5 x 7 cm / 3,5 x 1,4 x 2,8 inches Application: Do detection of carbon dioxide concentration in air Battery attribute: 3,7V lithium battery, battery capacity: 1200mAh Indication of carbon dioxide: 0 do 799 p. /min: Flashes green 800 do 1199 p. /min: Flashes yellow 1200 do 1599 p. /min: Flashes orange 1600 do 1999 p. /min: Flashes red Above 1999 ppm: Four colors flash List of packages: 1 x Carbon Dioxide Detector 1 x USB Plug 1 x User Manual