WeMos D1 WiFi UNO ESP-12E Based ESP8266 Shield For Arduino Compatible. This is the old version of WeMos D1. 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported (except D0).
The WeMos D1 is an ESP8266 WiFi based board that uses the Arduino layout with an operating voltage of 3.3V.
Operating Voltage: 3.3V
Digital I/O Pins: 11 (all I/O pins have interrupt/pwm/I2C/one-wire capability, except for D0)
Analog Input Pins: 1 (3.2V max input)
On-Board Switching Power Supply
Input Voltage Range: 9V to 12V
Output: 5V at 1A Max
Flash Memory: 4MB
Board Dimensions: 68.6mm x 53.4mm (2.701″ x 2.102″) / Long x Wide