Features: Measuring :Temperature,Humidity,CO2, Accuracy:Temperature：+/- 0.5°C ，Humidity：+/- 3%RH ，CO2: +/- (50ppm+3%) Sensor:Humidity：Capacitive CO2： NDIR Correspod time: CO2 :,(T90) 60s; Temperature and humidity: 1/e(63%)change ,Slow flow rates 10s Alarm: Sound and light alarm Operating: Touch buttons USB interface Input power : 5VDC Power consumption :1.5W