The Midwest eStylus: Pre-programmed torque limiting senses resistance and automatically reverses file to limit torque applied. Fiber-optic lighting provides illumination during rotary endodontic procedures. Fiber-optic light on handpiece flashes to indicate file is reversing... no beep to alarm your patient. 4 torque-limit settings allows you to choose appropriate torque setting for each stage in procedure. In endo mode, foot-control automatically switches from variable to on/off - ensuring speed stays constant