Function description: external controller, there are two types: 36V and 18V. 36V grass cutter applies no HALL mode, it can also be used on grass trimmer, shrubs cutter and branch saw. 18V grass trimmer applies HALL mode by which cost is reduced, working under speed control and closed loop current control, it has brake function by which blade rotation can be stopped very quickly; The function of time delay for power cut after the tool is stopped working can realize zero power consumption.

Protective functions: over current protection; low voltage protection; overheat protection (for control board and motor); motor blocking protection; starting up protection etc.