The Philips HC3520 Hair Clipper is a simple clipper, excellent for general use. The guide comb provides 13 length settings 0.5mm to 23mm. Trim-n-Flow Technology designed to prevent cut hairs from getting stuck within the comb. Ergonomic design means the clipper is easier to hold. Up to 75 minutes of run time on an eight hour charge and it can also be used plugged in for continuous power when you need it. The DualCut Technology blades are washable for easy cleanup under running water. Zero maintenance, with self-sharpening blades and no oil needed.