® PATENTED ACU•CONTROL SYSTEM • Patented Acu•Control System - Guide comb flexes and adjusts automatically to facial contours for consistent, precise trimming results every time! • Flexible Comb is simple to maneuver and easily trims difficult to reach areas such as throat and chin • Patented Zoom Ring adjusts among 9 different settings (.06”-.72”/1.5-18mm) to trim hairs precisely and evenly, for the look you desire...