Features Smart And Compact: This is a universal smart small sensor that uses the principle of non dispersive infrared (NDIR) to detect the presence of CO2 in the air. 2 Output Modes: Built in temperature compensation, with serial output and PWM output at the same time, easy to use. Good Performance: The sensor is a high performance sensor that closely combines mature infrared absorption gas detection technology with accurate optical path design and accurate circuit design. Stable And Durable: Carbon dioxide gas sensor module have excellent stability and long service life, you can use with confidence. Excellent Performance: The sensor module is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stability. Specification: Item Type: Infrared CO2 Sensor Module Detectable Gas Type: CO2 Working Temperature: 50 (℃) Accuracy: ±50PPM Output Type Serial Port: UART or PWM Power Supply Voltage: 5 (V) Supply Current: 70 (mA) Package List: 1 x Infrared CO2 Sensor Module Package List 1 x Infrared CO2 Sensor Module