Rosenstein & Söhne Self-stirring electric mixing cup, 450 ml
450 ml · battery-powered stirrer · sealed lid
A small battery-powered cup with a built-in electric stirrer rather than a true shaking mechanism — closer to a self-stirring mug than a bartender's shaker. Listed under Amazon's own Cocktail Shaker category on both markets checked, at the lowest price in this family.
Best for: A low-cost, portable way to mix a simple drink on the go, for someone who doesn't need the specific aeration and dilution a true shaken cocktail requires.