The WIFi D1 mini PRO is an integrated ESP8266 based WiFi enabled microprocessor unit with 8Mb/16Mb/32Mb (Megabit) flash memory.
The board has an embedded CERAMIC WiFI antenna and socket for connecting an external antenna. For communication with a PC (USB-TTL), the board uses CP2104 USB driver (driver installation required)
WIFi D1 mini board uses the Arduino IDE.
Power IN: USB 5V
DC Power IN: 4-9V to pin 5V (if have any shield for use 5V, better power supply exactly 5V)