No batteries or electricity are required to operate this portable grinder, manual coffee grinder lets you enjoy freshly ground coffee anywhere. Particle thickness can be adjusted by rotating the nut on the top to adjust the grinding size you like. Manual coffee grinder It can be used to grind coffee and vanilla, nutmeg, salt, pepper and other spices. The manual design can provide more enjoyment in brewing coffee and ensure more aromatic coffee, because the coffee beans will not be heated during the grinding process. manual coffee grinder Equipped with a robust ceramic grinding mechanism with stainless steel housing and ergonomic wooden handle.