As effective as it is unique, the patented BlenderBottle by Sundesa, will effortlessly mix lump-free protein drinks, nutritional supplements, and meal replacement drinks. It is also great for mixing eggs (omelets, scrambled, French Toast), pancake batter, gravies, homemade dressings and marinades, pudding, yogurt smoothies, and much more. It also works great simply as a water bottle. The key to this unique product is what's inside. It's called a BlenderBall. Open with caution.