Built with a high-speed rotary motor that runs at 7,200 strokes per minute, the Master® can shave wet or dry hair effortlessly. It features Constant Speed Technology so it doesn't stall or falter. The motor is housed in an unbreakable and robustly beautiful aluminum body that is shaped to hold comfortably in the hand. Power is provided by a lithium-ion battery that works for 90 minutes and fully charges in just 60 minutes. The entire clipper weighs only 370 grams - that's actually lighter than the corded Mastered® so your hand and arm are less stressed and you can shave longer. The Andis Master® features an adjustable blade that adjusts between # 000 (0.5 mm) and # 1 (2.4 mm) via the integrated cone handle. It can also be used in many countries, as in the box you will find plug adapters for just about any kind of outlet. Working time: 90 minutes Charging time: 60 minutes! Stainless steel blade Use with and without cord Extremely powerful motor 7,200 rpm Lightweight aluminum housing 370 grams Knife adjustable from fine to coarse .# 000 (0.5 mm) and # 1 (2.4 mm) LED light for battery level Use: Always oil the blades before use and for the first time also oil. When the blades are dry there will be wear on the blades and they will become hot. Let the clippers well up before use. Charging via charging stand.