ESP8266-DevKitC WiFi Development Tools Espressif Systems ESP8266-DevKitC Wi-Fi Development Tools are small space-saving boards designed to support various ESP8266 modules, including ESP-WROOM-02D and ESP-WROOM-02U. These ESP8266-DevKitC development tools feature 5V to 3.3V LDO, dual switch, USB-to-UART bridge, micro USB port, boot button, and I/O connector. The Espressif Systems ESP8266 development kits support the 802.11 b/g/n protocol and are available in 44.9mm x 25.4mm dimensions.