USB interface, built-in high-density lithium-ion polymer battery, compatible with most mainstream adapters, power , computer power supply, more environmentally !Tip: The hair is by a motor, which is relatively low noise and not without sound.The hair is water-. Rinse the head with water after finishing your hair.Material (composition): ABS"R" chamfered ceramic knife head design-rounded teeth, no harm to delicate skin, more secure.Five hours of charging and 60 minutes of continuous use.Each haircut is about 20 minutes. Although the power of the hair can not be used up every time, the power will decrease during placement. This is the characteristic of the battery, so remember to charge it frequently.Low noise and low vibration, using a copper copper shaft DC motor, effectively reducing the noise and protecting the baby from surprise and cooperating with a haircut.Description ：Package included: 1 pc Hair + Storage bagProduct Size:13.5*5.5*15.6(L*W*H)/5.3*2.2*6.1"Tips: Please use oil to maintain the hair after cleaning. For the specific oil drip position, see the picture description.