Using only one hand, immerse the trimmer and water is pulled in from the sides, spun through the unit and ejected from the top. Simple and thorough cleaning. Dual-edge blade cuts hairs which enter the trimmer from not only the sides but also the top. Perfect from trimming individual stray hairs on the eyebrows or for beard detailing. Curved, hypo-allergenic stainless steel blades are used that leave the proper amount of hairs for natural filtering.