SpecificationsMaterial: ABSSize: 14x6.5x9cm/5.5x2.5x3.5"Working power: 4 x 3.7V 14500 batteries (NOT included)FeaturesBuilt-in guide holds the blade at the perfect angleProfessional grade high speed rotating sharpening stone sharpens and hones the blades edgeIncredible cordless motorized knife sharpener - Precision power sharpeningKnife Sharpener includes catch tray for metal shavingsCompact design for easy storageProfessional grade, high-speed rotating sapphire stone shapes and hones the bladePlease note:NOT suitable for big knife such as kitchen chopping knife, carving knife etc.Large power consumption machine. Please be kindly noted about this.Please gently put your knives on the blade without strong pressure, otherwise the rotating stone may be damaged