The upgraded version (R2) has two more functions than the old version (R1).
1. pin location changed
2. compatible nodemcu

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

Package Include:
1*OTA WeMos D1 R2 CH340 WiFi Development Board