Type: Display Screen Module / Sensor Module (Optional)Display Screen Module:Features:Mainly used to detect carbon dioxide and temperature/humidity in the air.Main board display module of carbon dioxide detector.Support manual calibration and automatic calibration.Suitable for the DIY of CO2 detector or air quality detector.Specifications:Material: ABSandPCBOperating Current: 100mABattery Voltage: 3.3-4.2VCharging Voltage: 4.5-5.5VCharging Current: 500mASensor Type: Patch high precision temperature and humidity sensorItem Size: 190 x 75 x 3mm / 7.48 x 2.95 x 0.12inItem Weight: 50g / 1.76ozPackage Weight: 60g / 2.12ozPackage Size: 20 x 8 x 0.5cm / 7.87 x 3.15 x 0.20inPacking List:1 x ModuleSensor Module:Features:Infrared carbon dioxide sensor module that used to detect carbon dioxide in the air.Infrared sensing technology is adopted for accurate detection.With automatic calibration function.Provide DIY assembly testing equipment and experimental learning for electronic enthusiasts.Suitable for appliance/industrial /HVAC systems.Specifications:Material: ABSandPCBWorking Principle: InfraredMeasuring Range: 400-5000ppmMeasurement Accuracy: 50ppmPreheating Time: <1min.Response Time: <30sCommunication Interface: TTLWorking Temperature: -10-60Storage Temperature: -20-70Item Size: 32.5 x 21 x 10mm / 1.28 x 0.83 x 0.39inItem Weight: 35g / 1.23ozPackage Weight: 50g / 1.76ozPackage Size: 3.5 x 3 x 1.5cm / 1.38 x 1.18 x 0.59inPacking List:1 x Module