Gas chamber with gold plating, waterproof and High sensitivity, low power consumption Excellent stability Application: HVAC refrigeration equipment; Air quality monitoring equipment; Fresh air system; Air purification equipment : CO2 Sensor Module Gas Detection: Carbon Dioxide Voltage: typ5.0V min4.5V max5.5V Average current: 70mA current: 150mA Interface level: L less than 0.8@3.3 H more than 2.7@3.3 Measurement range: 400~5000ppm Warm-up time: 3min Response time: T90 Less than 120s Working temperature: -10+50C Operating Humidity: 0 to 85% RH (non-condensing) colour: silver Material: metal size: 33x21.2mm Package Contents: 1 x CO2 Sensor Module Only the above package content, other products are not included. Note: Light 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.