Removable battery for quick and easy replacement! 3-hour run-time on a single charge. Lithium-ion power mated with powerful rotary motor to cut any hair type 5 speeds: Adjustable from 2,500 to 4,500 strokes per minute. Equipped with a size #10 CeramicEdge blade. runs cooler and stays sharper than steel. Works with all UltraEdge® CeramicEdge® and Show Edge blades.