Overview 

• The W-O04WiFi module is developed based on the ESP8266EX chip. 
• The module integrates the transparent transmission function and supports the Airkiss protocol, which is ready to use. Users can use the network access function through the serial port.
• The module supports 802.11b/g/n wireless standards, supports STA, AP and WiFi direct connection mode; external MCU devices can easily access the WiFi wireless network through the serial port, and then realize network control and management. 

Features

• [PCB size board layer]
• ---Number of layers: 4 layers
• ---Size: 16x17x3mm
• ---Interface: standard 2mm half-hole stamp pin, directly attached to the circuit board application
• ---Material: high dielectric constant and low loss sheet material for radio frequency 
• [Module Features]
• ---Antenna: IPEX antenna antenna
• ---Working voltage: 3.0V-3.6V
• ---WiFi protocol: 802.11 b/g/n
• ---Support WeChat Airkiss configuration protocol
• ---Transmission distance: visual transmission distance up to 120 meters
• ---Socket role: support TCP Server, TCP Client, UDP
• ---Resources: ESP8266 I\0 resources are partly derived for secondary development
• ---Power consumption: maximum transmit power 18.5dBm, deep sleep current <10uA 

1. ESP8266EX-W004 x1
2. Options IPEX antenna x1