ITEM NAME:ESP-8266EX D1 ESP8266 Mini Pro 16M Bytes External IPEX Connector BT Antenna Descriptio n Description: 1. Based on the ESP - 8266 2. Arduino-compatible, programming with Arduino IDE 3.11 the XI/O pins 4.1XADC pin (input 0-3.3v) 5. OTA launching is supported 6. On-board 5V 1A switching power supply (maximum input 24V) Specifications: 16M bytes(128M bit) Flash External antenna connector Built-in ceramic antenna New CP2104 USB-TO-UART IC Same size as D1 mini, but more light Package Included: 1x Mini D1 PRO upgrade ESP8266wifi development board + antenna Note: 1.Due to the manual measurement and different measurement methods, the actual size could be slightly different. 2.Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the website's photo and the actual item could be slightly different. We offer you what you need! ESP-8266EX D1 ESP8266 Mini Pro 16M Bytes External IPEX Connector BT Antenna.16M bytes(128M bit) Flash. Based on the ESP - 8266. External antenna connector. Built-in ceramic antenna. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted.