Bottle stopper

A bottle stopper comprising:

• a first connection part including two opposite cutouts defined on a peripheral side of the first connection part;
• a second connection part connected on a bottom of the first connection part, and a space being defined between the first connection part and the second connection part;
• the second connection part including an aperture passing through a center of the second connection part;
• an actuation member including an extension sheet arranged on a top of the actuation member, a post extending from a center of a bottom of the extension sheet, and a threaded portion formed on a bottom of the post, the bottom of the post extending through the aperture of the second connection part;
• an operation unit including two projections and a drive element, wherein two distal ends of the drive element are connected with two eccentric positions of two outer surfaces of the two projections respectively;
• wherein the two projections are located below the extension sheet, and the drive element extends through the two opposite cutouts of the first connection part;
• a fitting sleeve being hollow and being made of flexible material, and the fitting sleeve being arranged on the post below a bottom of the second connection part;
• a base including a screwing orifice defined on a top of the base, and the threaded portion of the actuation member screw into the screwing orifice;
• and
• wherein the fitting sleeve sits on the base.