Philips NT3650 / 16 can easily trim nose, ear, and eyebrow hair. Its revolutionary Precision-trim technology and protective protection system cut hair safely and effectively without irritation. This trimmer is powered by two AA batteries. Before using, make sure that your nostrils are clean and do not insert more than 0.5 cm trimmer inside your nose. Make sure your ears are clean before cutting your ear hair. Slide one of the two combs (3 and 5mm) into the groove for the eyebrows and trim with light pressure against the hair growth so that you can get the eyebrows to a certain length.