Use note: 1, put on the head "should not be around too much, so as not to increase the load. 2, should not be used when using force too hard, make the pole pole head deformation, vibration discomfort, such as has occurred, should be alignment before using. 3, try to avoid the impact or play, in order to avoid damage, affect the normal use. 4, used for the first time, should be sufficient electricity, the battery power run out before you