The portable Kooz grinder is a specialized and efficient grinder for preparing drip coffee, and it is also suitable for grinding to fine levels for espresso. The Kooz grinder features a 38mm burr, which is distinguished by its 10 blades for more consistent grinding. - Portable and rechargeable cone grinder - The hopper can hold up to 35G. - The battery duration for a single charge is between 18 to 25 hours.