D1 Mini Pro board (compatible board) with 4 MB flash memory and ESP8266 chipset. The board can be programmed with Arduino IDE, has the CP2104 USB chipset and allows easy and fast creation of IoT devices. Technical Data - 11 digital input pins - all Pin's have interrupts - PWM/I2C & One-Wire support - 1 analog input (max. 3.3 V) - 4 MB Flash - onBoard WiFi antenna - u.FL antenna socket for connection of external antenna - microUSB connector - CP2104 UART - USB converter Note:To use the external U.FL antenna socket, it is necessary to implement a jumper. See figure 4 Scope of delivery 1x D1 Mini Board (compatible equivalent) 2x pin header short 2x male header long 2x female header https://elecena.pl/product/18310355/d1-mini-pro-compatible-esp8266-board-cp2104 2021-05-03 https://elecena.pl/product/18310355/d1-mini-pro-compatible-esp8266-board-cp2104 2021-10-20