ALL-IN-ONE COFFEE MACHINE: Keep grinding, filtering, brewing, storing, portable in one. ECO FRIENDLY AND MUTE: Removable hand crank eliminates over 90% of the noise that electric coffee grinders produce. PORTABLE AND MANUAL: Similar size to ordinary mugs. Purely hand operate. HUMANE THOUGHTFUL DESIGN: Smooth stainless steel liner can hold hot and cold water. External rough surface is anti-scald, non-slip, insulated. FRIENDLY NOTE: No heating in microwave. Avoid storing coffee in mug for long term.