CH340G Programmer USB to ESP8266 ESP-01s Wifi Adapter Module

Features:
ESP-01S Programmer USB to ESP-01 adapter module has USB to TTL driver chip CH340G onboard, so you can easily use your computer to do ESP-01 functional debugging.
It is a great programmer for the ESP-01/ESP-01S. It's very easy to just plug it in and send AT commands, or flip the switch to program and upload a sketch from Arduino IDE. Also you don't need a separate 3.3V power supply to power the ESP-01. (Please make sure that you set EPS-01/ESP-01S wifi module correctly in the female header when you plug it. )

Spec:
Working voltage: 4.5V - 5.5V (On-board 3.3v LDO Regulator)
Working current: 300mA(LDO regulator can supply)
Selectable working mode: There are two working mode that you can choose via the toggle switch onboard. PROG side is for firmware programming, while UART side is for serial TTL debugging by AT commands.
USB to serial TTL chip: CH340G
Logic level: 3.3V
Applications: Home automation, Sensor networks, Industrial wireless control etc.

ESP8266 ESP-01S 4MB Serial WIFI Wireless Transceiver Module

Feature:
This is WiFi serial transceiver module, based on ESP8266 SoC.
The SOC has Integrated TCP/IP protocol stack.
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.
ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime.

Spec:
802.11 b/g/n
LWIP agreement
Support 3 modes: AP, STA, AP + STA
4MB Flash: XMC0H32BHIG/XM25QH32CJIG by random