A practical, all-in-one industrial Programmable Logic Controller (PLC) by Huaqingjun, featuring 16 inputs and 16 relay outputs, supplemented with 2-channel analog inputs and outputs (2AI 2AO) compatible with 0-10V / 0-20mA signals. It stands out with its built-in display and control keypad, allowing direct programming and parameter adjustments on the fly (program it via button key) without constantly requiring a PC connection. An excellent, cost-effective choice for controlling inverters, pumps, small assembly lines, and field automation systems.