The external mechanical force of the small microswitch exerts force on the action reed through the driving element. When the action reed moves to the critical point, the dynamic contact and the fixed contact at the end will be switched on and off quickly. When the force on the drive element of the small microswitch is over, the action spring produces reverse power. When the reverse travel of the drive element reaches the critical point of the reed, the reverse action is completed, providing great convenience.