The Gold Ratio 28 TeethSafer Cutting System EANCEIL baby per equipped with fine cutting unit. The special 28 teeth cutting unit patent technology is different from the mon 20 teeth. The technology makes it easier for this clipper to catch and cut babies' soft hair without pulling hair or scratching skin. Specially Designed R Round Cutting unit Special widened R-shaped round corner design of the cutting unit,with Cullinan ceric blade,make the outside of the cutting unit more rounded,and more inside. This design allows you to give your baby a safer,efficient and fortable haircut. Advanced Noise Reduct TechnologyEANCEIL baby hair trimmer is featured with Low Noise Technology in the precis motor. This advanced technology helps the hine works in low vibrat and with working noise only about 50db. This ultra quiet feature can make your baby feel relaxed while trimming and not be afraid of hair cutting anymore. Detachable and fully Washable The cutting unit is detachable,and the whole body of this baby hair trimmer is waterproof at an IPX-7 level. This waterproof per can be cleaned and work normally when its body is dipped in the water for a short time. It would be easier to tidy up the hair by using the provided brush and then clean it in water. Multiple char ways and Long Battery Life The haircut kit This trimmer is cordl and recharable,and it also can plug-in use directly. It es with a USB cable. You can char the hair trimmer by pling it into an AC adapter,power bank or any other USB enabled charr. Ni-Mh/600Mah*2 series cect battery support a operat time of more than 60 minutes..