Features:
Main control: esp-01 / esp-01s (this module does not include esp-01 / esp-01s)
Temperature and humidity sensor: DHT11
Working voltage: DC 3.7 v-12v (support for 3.7V lithium battery)
Measurement range: 20-90% RH 0 to 50 °
Accuracy of measurement: temperature: plus or minus 2 ° humidity + / - 5% RH