You can grind up your herb as fine as you would like also flip it over to store your herb in a sealed air tight jar. The BESTWAY2SMOKE ELECTRIC GRINDER is perfect for travel. Description 1. Size ：height 90mm *Diameter 48mm 2..weight ：150g Instruction: 1. Release the start button, the corresponding battery indicator is extinguished, and the grinding stops. Battery Indicator: 3.20v-3.60v red light 3.60v-4.20v green light