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; won’t drag or stall. Unbreakable, lightweight aluminum housing for years of dependable use. Carbon-steel blade is adjustable from fine to coarse (#000–#1). Cord/cordless operation features an LED light to indicate battery power levels.