This WeMos D1 R2 WiFi UNO is the upgraded version of the old version.

Specs:
-based on the ESP-8266
-Arduino Compatible, you can use it on Arduino IDE.
-NodeMcu Compatible
-Operating Voltage: 3.3V
-Digital I/O Pins: 11 (all I/O pins have interrupt/pwm/I2C/one-wire capability, except for D0)
-Size: 68.6mm (L) x 53.4mm (W)


For more information about the module, please visit: www.wemos.cc

Specs: