Instructions for use1.Rotary switch comes with: open, close, speed;2.Forward and reverse buttons, default positive rotation (display: F)3.USB charging port can provide mobile phone charging function.4.Type - C grinder charging interface.5.Connect the connection port of the polishingpen to the host o 6Pause button can pause the function in use;6.Speed display: 00-45RPM, representing 0-45000Turn to adjust the number. Forward and reverse display: the default forward rotation " F " at boot, press onePress the power button to reverse the "R", and press the power button again Key toreturn to forward rotation.7.Power display: When the battery is turned on, the battery compartment is empty, which means the battery is dead, and the battery compartment is full, which means the battery is fully charged.8. The pen holder can be inserted on the left and right sides.9.Tighten the steering head of the pen, place the polishing head on the bottom and clamp it.10.Equipped with belt clip, easy to carry and use.