Single-Core Wi-Fi Modules Espressif Systems Single-Core Wi-Fi® Modules are compact, high-performance, low-power devices designed to provide a complete Wi-Fi solution tailored to advanced IoT applications. Based on the Espressif ESP8266EX 160MHz Single-Core Wi-Fi System-on-Chip (SoC), these Modules feature a wide range of peripherals, software stacks, flash memory, and an integrated PCB antenna.