D1 WiFi R3 Development Board ESP8266 ESP-12N Wemos OTA

Feature: 
Based on the ESP-8266EX. 
Arduino Compatible, you can use it on Arduino IDE. 
11 Digital I/O pins 
1 Analog Input pin 
OTA — Wireless Upload (Program) 
On board switching power supply — Max 24V input, 5V 1A output