The SGP40 is a digital gas sensor designed for easy integration of element and gas index algorithms. to contamination present in real-world applications, CMOSens technology provides a complete, gas-free sensor system, enabling long-term stability and low drift and device-to-device variation. The very small 2.44x2.44 digital I2C interface and temperature-controlled micro-hotplate provide a humidity-compensated VOC-based indoor air quality signal. The output signal can be directly processed by powerful gas index algorithm in a limited space. advanced production process ensures high repeatability and reliability when converting raw signals into VOC indices as a robust measure of indoor air quality. Product model:SGP40 Supply voltage:3-5V output:IIC signal VOC index range:0-500 Working humidity:0%RH~90%RH Sampling rate:1Hz Storage temperature range:5° C-30° C Cable length:3 meters (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: plastic Package Contents: 1 * Sensor module Only the above package content, other products are not included. Note: Light reflection 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.