Core MCU and compatibility - Uses Atmel ATmega328P-AU MCU with CH340 USB-UART bridge configured to official specifications for reliable operation. Programming options - Supports ISP programming and USB download, enabling flexible workflow and easy updates. Power and portability - USB powered and capable of USB download. - External 5V to 12V DC power input; also supports operation from a 9V battery for portable use. Key benefits - Reliable, well-supported MCU with broad compatibility in ATmega328P-based projects. - Flexible programming and power options reduce setup time and widen where you can work. 2-3 practical use scenarios - Prototyping Arduino-compatible projects that require both ISP and USB programming. - Firmware development and on-bench testing with USB power. - Portable projects or field work using a 9V battery or an external 5–12V supply.