The NuMaker-M252SD development board, built on the M252SD2AE MCU, features Arduino UNO-compatible headers, full pin extensions, flexible power options, and an ammeter connector for power monitoring. It comes with a detachable Nu-Link2-Me debugger/programmer supporting SWD, online/offline ICP, VCOM, and 16 Mbit SPI Flash, making it ideal for rapid prototyping and mass production programming.