The Wahl 5546 Ear, Nose and Brow trimmer is a rotary trimmer and comes with a detail blade for extra precision. It is very precise and safe, convenient and easy to use. The circular blade system ensures the is no pulling or tugging. The trimmer is Wet/Dry for use in the shower or easy cleaning under the tap. The 5546 runs on a AA battery (not included). If the trimmer blades pull or snag your facial hair within the first year, return it for replacement at no cost to you.