The simple and ergonomic design of this trimmer means ease of use and convenient storage for users. A patented and unique length setting system relies on an innovative, precise and reliable rotary dial and a rotating plate with a planar helix groove so that users can easily adjust the trim length setting from 0 to 40mm. Moreover, the trimmer has anti-fingerprint surface treatment and a whole-body waterproof design, which makes it suitable for both wet and dry grooming routines and easy to clean.