Description:
ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
USB to ESP-01 Module Adapter uses CP2104 USB to serial port chip, and adds ESP8266 automatic download circuit. It is very convenient for users to download programs, upgrade firmware, serial port debugging, etc. to Essence ESP-01/01S, and can be used for Arduino IDE, ESP8266Flasher and FLASH_DOWNLOAD_TOOLS software. Key download. No wiring required, no need to press any button. The WiFi module will automatically enter the download mode.

Specifications:
ESP01 module:
Serial/UART baud rate: 115200 bps
Input power: 3.3V
I/O voltage tolerance: 3.6V Max
Flash Memory Size: 1MB (8Mbit)
WiFi security modes: WPA, WPA2

NodeMCU firmware download example:
1. Insert ESP-01 or ESP-01S correctly
2. Insert the computer USB interface and view the serial port. If there is no driver, please download the CP2014 driver:
Download link: http://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
3. Set related parameters and select firmware

Packing List:

2 * ESP8266 ESP01 Serial Wireless Transceiver Wifi Module
2 * USB to ESP8266 ESP01 Adapter