Megaphone with it makes an uproar to fall subtracts resonance function

The utility model discloses a megaphone with it makes an uproar to fall subtracts resonance function, the on -line screen storage device comprises a base, the last fixed surface of base is connected with and falls the ring of making an uproar, falls the interior anchor ring of the ring of making an uproar and offered the cylindricality hole, and the cylindricality hole is 19, falls the outer anchor ring of the ring of making an uproar and offered spherical pore, and spherical pore is 19, spherical pore's medial extremity and the outside in cylindricality hole end intercommunication, the surface that it makes an uproar to fall encircled has been cup jointed and has been fallen the net of making an uproar, the last fixed surface of base is connected with the arc mount, through installing cylindricality hole and spherical pore additional for falling the ring of making an uproar, can not make this device send the effect of abnormal sound when having realized that this device is outside andblowing to this device,