Battery powered, this electric ceramic knife sharpener is the perfect solution for at-home resharpening and refreshening of your ceramic kitchen knives. Ideal for Kyocera Ceramic knives, the diamond grinding stone can take up to .5mm nicks off a blade, achieving a 35-degree angle. A convenient knife guide slot and assist roller allow for a user-friendly and controlled sharpening of the blade. For left or right handed use. Not recommended for metal knives. It"s easy to clean since cover and grinding stone unit is separate. A replacement diamond grinding stone is available for future use. Not recommended for the following Kyocera knives: KT-075-HIP-D, KT-200-HIP-D, KC-25N WH, FK-125N WH or BK.PS-180 BK. Battery Powered: 4 AA batteries not included.