The WiFi Development Board is D1 mini, which is a mini NodeMcu Lua WiFi board based on ESP-8266EX. It has 11 digital input/output pins, all of which have interrupts/PWM/I2C/support for 1 wire (excluding D0); 1 analog input (maximum 3.2V input). Micro USB connection; Compatible with Arduino; 1MB flash memory; 500mA resettable fuse. The Internet Development Board has a 4M byte. 5V 1A switching power supply (switching power supply) onboard.