KORG Clip-On Tuner LCD Meter is Backlit & Reversible Blue AW2GBL Clip-on chromatic tuners that attach directly to a wind instrument or string instrument for cable-free tuning AW2G comes with a clip that's optimized for attaching to a guitar headstock Double ball-joint allows multi-angle positioning with far greater mobility for the display section Internal backlight ensures excellent visibility even on a dimly lit stage Energy-saving Auto mode automatically switches to the low-power Soft mode when no sound is present