The ESP-C3-13U-4M with Module WiFi Modules ROHS is a Wi-Fi module manufactured by Ai-Thinker. It is based on the ESP8266EX and features small size, low power, and reliable performance. The module supports 802.11 b/g/n protocol, two-way RX/TX anti-interference, and supports STA/AP/AP + STA dual mode. It is a low cost, low power and high performance IoT solution that makes connecting devices to the cloud easier. It has an onboard PCB antenna, 4MB SPI flash, and supports WPS. It also supports UART, I2C, SPI, and Uart-Wifi interfaces, making it a great choice for IoT applications.