Features 1.TCP/UDP Protocol: Controlled via using the UART AT command supports TCP/UDP communication. 2.Standard Header: This ESP8266 WiFi expansion board has standard RasPi Pico header UART communication and AT command control. 3.Three Modes: This ESP8266 WiFi expansion board supports STA AP and STA+AP three WiFi operating modes. Supports TCP/UDP communication. 4.Stable Connection: This ESP8266 WiFi expansion board features enhanced impedance matching more powerful signal and more stable connection. 5.Function Button: This ESP8266 WiFi expansion board has two functional buttons convenient for user to update AT firmware through RasPi Pico. Specification Item Type: ESP8266 WiFi Expansion BoardMaterial: Printed Circuit BoardCommunication Interface: UARTBaud Rate of the Serial Port: 115200 bpsWifi Standard: IEEE 802.11b/g/nFrequency Range: 2400 ~ 2483.5 MHzWifi Working Mode: WiFi STA WiFi AP WiFi STA+APAntenna: OnboardPrinted Circuit Board AntennaOperating Temperature: -40 ~ 85Product Size: Approx. 58 x 25mm / 22.83 x 9.84in ( Manual Measurement Slight Error May Exist ) Package List 1 xESP8266 WiFi Expansion Board