The oilhead stain steel cutter head of this professional hair trimmer is sharp, never cuts hair, doesn't hurt skin, and makes little noise. voltage: 100–240v/10w size: 18*4.5 cm; rechargeable; 3.5 hours to charge; 400 minutes to run; not waterproof; limit comb: 1 mm, 3 mm, 4.5 mm, 6 mm, 9 mm, and 12 mm low noise Adjustable 15-level speed cutter head LCD display oil (0.8–2 mm) not included