This milk mixing mug earned The Best rating from the Hammacher Schlemmer Institute because it blended drinks the most thoroughly and was the most durable unit tested. Using chocolate syrup and chocolate powder, the Best model produced chocolate milk that was ranked as the best tasting by a child panelist and left the least amount of residue on the bottom of the mug. In durability tests, the Best model survived several drops from 5' and never leaked even when shaken and flipped upside down. The three-watt mug blends drinks at 6,000 rpms, is dishwasher safe, and has a rubber seal around the battery compartment that keeps out water. It holds 10 oz. of liquid and includes a twirly straw with an attached cow figure. Dishwasher safe. Requires two AAA batteries. 6 3/4" H x 3 1/2" Diameter. (10 oz.)