VOLTRX is great. It fits my Herbalife shakes. Worth buying!

　　My husband loves this mixer shaker bottle so we bought two. Great protein mixer cup, works great, the only downside is that there is no option for a metal blade. You can use the metal blade or replace the plastic blade when you want to make a thicker drink.

　　The VOLTRX portable vortex mixer is easy to use and the instructions are simple! I love the glowing markings on the voltrx blender jet, I've been using it for a few months now and couldn't be happier. It is very easy to use, just put in milk or water to start and then put in the protein powder. After a few seconds, it's mixed. For anyone wondering, the protein drink mixer electric is not for breaking up ice or breaking down fruit.