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ESP8266 DHT11 Temperature&Humidity Wifi Shield Sensor Module: Operating voltage: DC 3.7 V-12 V (support 3.7 v lithium battery power supply) Measuring range: 20-90% RH 0-50 ° C Measurement accuracy: Temperature: ± 2 ° Humidity ± 5% relative humdity ESP-01S ESP8266 Wifi WirelessTransmission Module: Operating Voltage:3.0-3.6V(We recommended 3.3V) Operating Current:Average 80mA Operating Temperature:-40~125℃ Wireless Network Mode:station/softAP/SoftAP+station Safety Mode:WPA/WPA2 Encryption Type:WEP/TKIP/AES Network Protocol:IPV4,TCP/UDP/HTTP/FTP Application Example: 1. Power source: 3.7 V-12 V DC power supply connected to VCC GND (2.54mm pin) 2. Download the program to ESP-01S 3. Insert ESP-01 / ESP-01S into the 2 * 4 Pin Package Included: 1*ESP8266 ESP-01S Serial Wireless 1*DHT11 Temperature Humidity Wifi Module