The ESP8266 is a great stand-alone WIFI + MCU that is compatible with Arduino. When coupled with the DHT11 Temperature Humidity Sensor it makes this one powerful little package! When space is at a premium, this module is perfect!
Application: IoT Development
Supply Voltage: ESP8266 ESP-01
Dissipation Power: ESP-01S DHT11
Operating Temperature: Temperature Humidity Sensor Module
Model Number: ESP8266 ESP-01 ESP-01S DHT11 Temperature Humidity Sensor Module