Shernbao CoolEdge Clipper is made for professional clipping and trimming on all coat types. The patented blade cooling system keeps the blade cooler for longer. Features three speeds – 3,000, 4,000 and 5,000 strokes per minute. The lithium-ion battery offers a two hour run time and takes two hours to recharge from empty. The extra battery included can be charged while the other is in use, meaning you will never have any down time! Also, the unique charging station allows two batteries to charge at the same time!