Features:
1. WiFi using industrial-grade ESP8266 chips, modules for ESP13 with metal shield, strong anti-interference ability;
2. standard pin compatible with the Ar-duin Uno, Me ga2560, such as main control board, a voltage conversion chip is used to connect with the Ar-duin Uno, 3.3V and 5V compatible;
3. a serial port using dual dial the code switch to control, makes the extension board can separate as Ar-duin Uno extended board is used, can also be used as ESP8266 extension plate;
4. Real serial WiFi, the Ar-duin program without any configuration;
5. WiFi based on the Web Server configuration parameters and serial port;
6. Can be used as an independent ESP8266 development board, download the official firmware the AT command, Node MCU open-source firmware, etc;
7. Can be used as an independent Ar-duin Uno expansion board, pins all leads.

Specifications:
1. Support wireless 802.11 b/g/n standard;
2. Support the STA/AP two working mode;
3. Built-in TCP/IP protocol stack, you can configure a socket;
4. Support the standard TCP/UDP Server and Client;
5. A serial port baud rate support: 1200/2400/4800/9600/4800/9600/57600/74800/115200 BPS.
6. A serial port data bits: 5/6/7/8;
7. Serial ports, parity: no;
8. Serial ports, stop bit: 1/2;
9. Standard Ar-duin UNO, Me ga pin spacing;
10. Which leads to the Ar-duin Pin 2/3/4/5/6/7/8/9/10/11/12/13;
11. Which leads to the ESP8266 GPIO 0/2/4/5 9/10/12/13/14/15/16 / ADC/EN/UART TX/UART RX.
12. RESET RESET;
13. KEY buttons reuse configuration function;
14. Two dial the code switch to realize the Ar-duin and ESP8266 serial port extension switch;
15. WiFi working current: continue to send: material 70 ma 200 ma (MAX), standby: < 200 ua;
16. Wireless transmission rate: 110-460800 BPS
17. Working temperature: - 40 + 125
18. Modules weight: about 20 g