ESP8266 ESP-03 Serial Wi-Fi Module Wireless Transceiver Send Receive 

• Support B/G/N
•  Communication range up to 100 yards depending on environment.
•  Standard 3.3VDC operation with 5V compatible I/O
•  Standard 3 wire (TXD/RXD/GND) serial communication (idle high) at 115200/8/N/1.
•  Standard 0.1" (2.54mm) half through hole.
•  Upgradeable firmware.
•  Three modes of operations: Client/Access Point/Both Client and Access Point.
• Support all major security schemes: OPEN/WEP/WPA_PSK/WPA2_PSK/WPA_WPA2_PSK.
• Support both TCP and UDP communication.
• Working as TCP/UPD server supports up to five (5) connections.
• Working as station can connect up to 5 TCP/UPD servers. The ESP-04 can connect to all standard non-SSL websites in the world.
• Simple AT commands for all operations.
• Connection based data reception or transparent data reception.
• Programmable client connection inactivity timeout.
• Automatic domain name address resolution for public domain name but not the local name within the local area network (router).

Package Included: 

• 1 X ESP8266 Wi-Fi Transceiver Module ESP03