Philips Hair Clipper – HC3420 is a cordless hair clipper . Advanced Dual Cut Technology which combines a double sharpened cutting element with low- friction engineering. Self-sharpening stainless steel blades for long- lasting sharpness. Simply select and lock in the length you want with the adjustable comb which provides 12 lock-in length settings from 1mm to 23mm, with precisely 2mm between each length. Or you can use it without the comb for a close 0.5mm trim. Quick release blades for easy cleaning.