Voltrx Premium Electric Protein Shaker Bottle Personally, the Voltrx Premium Electric Protein Shaker Bottle ($30) is my favourite shaker on the list, mainly because it's automatic. The lights in the detachable base tell you how much of a charge is left, and one charge usually lasts me a little over a month. Image Source: amazon.com Voltrx Premium Electric Protein Shaker Bottle $30 from amazon.com Buy Now