Overview: The sharpest any razor blade can be, ideally on a microscopic level, is one atom thick. The moment a razor blade meets the skin & stubble these atoms are removed & after a few uses the blade becomes dull. This razor blade sharpener will sharpen virtually every kind of razor blade from cartridge to a disposable razor, saving you £££s on replacement blades. Just pop your razor (with blade still attached) under the clamp, press the button & in less than 5 seconds the blade is honed (pulling the atoms back to the edge, giving you that razor sharp blade again)! Measuring a compact 14cm x 6cm x 4cm (5 ins x 2 ins x 1 ins), it requires 1 x AA battery (not supplied).