The Portek Chain Sharp 12v Chainsaw Sharpening Kit lets you sharpen chains on-the-go. This handy & compact sharpener runs off a 12v battery (commonly available) & can be kept in cars, tractors or work vehicles. It comes supplied with 3 different grinding stones, toolkit, cables & croc-clips. Replacement stones available. Specifications: Brand: Portek Power Supply: 12v (not included) Motor: 24000 RPMWarranty: 1 Year