Product Overview: Si7021 Temperature and Humidity Sensor is a digital temperature and humidity sensor with a calibrated digital signal output.  It adopts dedicated digital module acquisition technology and temperature&humidity sensing technology to ensure that the sensor has a very high reliability and excellent long-term stability.   The sensor includes an integrated single-chip temperature and humidity sensor chip, which connects to a high-performance 8-bit MCU.   The Si7021 sensor has advantages such as excellent quality, ultra-fast response, anti-interference ability and cost-effective.   The sensor has 2.5mm 4-pole stereo audio male plug connector, which works perfectly with Sonoff TH10/TH16.     Product Specification:  Precision Relative Humidity Sensor:  ± 3% RH (max), 0–80% RH;  High Accuracy Temperature Sensor:  ± 0.4°C (max), –10 to 85°C;  0 to 100% RH operating range;  Up to –40 to +85°C operating range;  Wide operating voltage (2.2 to 3.6 V);  Low Power Consumption;  Factory-calibrated;  Excellent long term stability ;     Product Advantage:  Relative humidity and temperature measurement;  All calibrated, digital output;  Good long-term stability;  No additional parts require;  Ultra-low energy consumption;  The sensor is fully interchangeable;    Package included:  3 x Si7021 Temperature Humidity Sensor