1、Better Control: 8 stage programmable, multiple stages speed control, optional multiple operation modes, simple PLC operation, optional torsion and speed control mode. 2、Standard Modes: Comes with standard RS485 RTU mode, multiple analogue input and output, such as 0‑5V, 0‑10V, 4‑20mA, 0‑20mA. 3、Reliable Works: PID control, constant pressure control, environmental protection and energy saving, low noise, low electromagnetic interference. 4、Safe for Using: Low frequency and high torsion energy saving, multiple motor protection methods, stepless speed regulation. 5、Great Security: Enables protection against over current, over voltage and under voltage, module failure, overheating, short circuit, input and output phase loss, abnormal adjustment of motor parameters, etc.