The OKY2257 NodeMCU Module Shield from OKYSTAR is an evaluation board with a small form factor designed to be used as an integrated interface between the NodeMCU and other hardware, providing additional features such as Wi-Fi, Bluetooth, GPIOs and other communication protocols. It is compatible with various NodeMCU boards and has a range of peripherals that can be used for enhancing the capabilities of the NodeMCU. The OKY2257 includes a microcontroller based on ARM-Cortex M4 technology, an integrated Wi-Fi module, USB port, UART port, and dual LED indicator lights. The board can be used for a wide range of applications, from connected devices to Internet-of-Things (IoT) scenarios.