Andis Supra ZR Cordless 5-Speed Clipper3 hour run time and a 2 hour charge. Best for: High Volume haircutting on all hair types Now with removable battery for fast, easy replacement Heavy duty, detachable blade clipper with a cordless design delivers a 3 hour run time on a 2 hour charge Lithium ion power mated with powerful rotary motor to cut any hair type wet or dry 5 speeds: Adjustable from 1,800 to 3,800 strokes per minute Detachable blade design offers the advantage of multiple blade