Catalog > Internet of Things (IOT) Related Products > More Platforms Sonoff Si7021 Temperature and Humidity Sensor Sonoff Si7021 Temperature and Humidity Sensor SONOFF TH TEMP SENSOR SI7021 SONOFF TEMPERATURE SENSOR. TEMPERATURE RANGE : -40C~+85C. HUMIDITY : 0~100%RH. OPERATING VOLTAGE : 2.2-3.6V Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Specifications Si7021 SensorTemperature Measuring Range : -40°C~+85°CHumidity Measuring Range : 0~100%RHStorage Temp. : –65°C~+150°COperating Voltage : 2.2-3.6VWeight : 26gLength : 0.5m