Hair Cutting Machine Ceramic Blade Low Noise Adult Kid Haircut Professional Hair Clipper Men' s Barber Beard Trimmer Rechargeable Product model:SH-1929Model:JM-720APower:10WVoltage:110-240V Battery capacity:800mA Net weight ( with packaging):0.32kgSize:21*9*4. 7 cmMaterial: stainless steel blade Suitable For Everyone intelligent anti- card system, which brings an extremely smooth experience. Easily cope with a variety of hair, smooth hair without leaking, and cut hair faster.● Low Noise Design IPX7 professional waterproof super sharp ceramic blade" Blade grade" martensitic steel, excellent quench hardening ability, high abrasion resistance and high strength, also used in shell surgical tools. After using for a period of time, the cutter head will automatically grind, so you won' t worry about the cutter head becoming blunt due to long time use. Nano Ceramic Cutter Head, Ultra Low Noise Smooth Speed Shear The hardness of nano- ceramics is 1. 6 times that of ordinary stainless steel, and the surface smoothness is much smaller than that of stainless steel.Therefore, when the hair clipper is running at a high speed, the ceramic cutter head generates less noise and is less prone to heat. The working noise is less than 55db, which is much lower than the GB standard 70db.