The conductor is holding a baton.

The conductor’s baton is a technical aid for conductors in orchestras and symphony bands to express the succession and transition of musical works. Its use mainly relies on the waving of the conductor's baton to reflect the mastery of the rhythm, beat, intensity and speed of the music, so as to guide the overall performance of the band. There is a small ball at the front end of the baton, which is mainly used to give the fingers something to rely on when commanding and prevent them from falling off. At the same time, the length of the baton is generally retractable and can be adjusted according to the conductor's habits and needs.