The mains/rechargeable function allows you to clip without the restriction of a cord and can be used on the cord if the charge is running low. Lithium Ion battery technology means an outstanding 90 minute run time from a 120 minute charge time. Convenient thumb lever adjusts the taper & texture without changing the blades. Uses existing Super Taper combs for added convenience. LED light displays when the clipper is charging. With an RPM of 5,500 this clipper delivers a solid cutting performance.