Microcontroller: WeMos ESP8266
Operating Voltage: 3.3V (pins are not 5V compatible)
Digital I/O pins: 11, all pins have interrupt/pwm/I2C/one-wire supporte (except for D0)
Analog Input Pin: 1 (max 3.2V)
Clock Speed: 80MHz/160MHz
Flash: 4M Bytes
USB-Serial Converter Chip: CH-340
Programming Port: Micro USB
Power Socket: Barrel type (8V - 24V DC Input)
Dimension: 68mm X 53 mm (l X b)
Supports Arduino and NodeMCU