Andis cordless master. Charging dock The classic performance you expect from the Master, now with cordless freedom and convenience! Lithium-ion battery delivers over 90 minutes of nonstop run time; charges in just 1 hour. Extremely powerful, high-speed rotary motor with blade speeds over 7,200 SPM, featuring constant speed technology; wont drag or stall. Unbreakable, lightweight aluminum housing for years of dependable use. Carbon-steel blade is adjustable from fine to coarse (#000#1).