ITEM NAME:GY21 Si7021 Industrial High Precision Humidity Sensor Interface For Arduino A1W8 GY21 Si7021 Industrial High Precision Humidity Sensor Interface For Arduino A1W8 Precision Relative Humidity Sensor +/- 3% RH (max), 0-80% RH High Accuracy Temperature Sensor +/-0.4 Celsius (max), -10 to 85 Celsius 0 to 100% RH operating range Material: plastic color: blue Up to -40 to +125 Celsius operating range Wide operating voltage (1.9 to 3.6 V) Low Power Consumption 150 uA active current 60 nA standby current Factory-calibrated Integrated on-chip heater 3x3 mm DFN Package Excellent long term stability Low-profile Protection during reflow Excludes liquids and particulates Up to -40 to +125 Celsius operating range Low Power Consumption 150 uA active current Applications: HVAC/R Thermostats/humidistats Respiratory therapy White goods Indoor weather stations Micro-environments/data centers Automotive climate control and defogging Asset and goods tracking Mobile phones and tablets Size: 1.3*1cm/0.51*0.39 INCH Package Contents: 1* Sensor Module Only the above package content, other products are not included. Note: Light shooting 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.