Blenders normally have between three to 16 speeds. Their Power Rating range from 300 to 500 watts. Manufactures claim that higher wattage translates into better performance but some tests show that lower-wattage models often outperformed beefier ones, turning out icy drinks faster and leaving them smoother in consistency.
Containers are made of glass, plastic, or stainless steel, and have a capacity of about 5 to 8 cups. A glass container is heavier and more stable. In tests, the blenders with glass jugs tended to perform better because they didn't shake. Glass is also easier to keep clean. Plastic may scratch and is likely to absorb the smell of whatever is inside. Stainless-steel looks good, but prevents you from seeing how the blending is going. The jars vary from 1.5 to 2 liters
Touchpad controls are easy to wipe clean. A blade that's permanently attached to the container is harder to clean than a removable blade.