10 operation buttons, 8single-speed buttons and one “STOP” one "START";Spare key can be set to start, acceleration, toggle switch, general or other function.
8 control contactors With battery voltage warning device, the power is cut off during low power;
Safety key switch to prevent from unauthorized user;
Set the internal functions by computer interface;
Up/down, east/west, north/south can be set as to mutual inhibition or not;