1, open the input power switch, rotate the potentiometer to select grinding time 20S/15S/10S/5S, press the "Start/pause" button, grinding start, grinding time, motor automatically stop.
2. During grinding, press the "Start/pause" button to suspend the motor and timing. Press the "start/pause" button again, the motor resumes operation, timing continues.
3. During the operation of the motor, the potentiometer changes the time range, and the time is timed at the new range.