Electronic LED Automatic Guitar Tuner with High Quality Easy operation with one control switches.Anywhere Easy-to-read LED indicator tell you which way to tune. Low power consumption and AUTO-OFF function.One pick included for free in the pick location at tuner's back. Tunable 360 degrees clip on design , allowing any observation angle.Tuning instruments: acoustic guitar,Tuning mode: automatically. High brightness LED displays string number and pitch difference, can be used in dark places and stages. If LED lights are weak or tuning gets less sensible, please replace battery, make sure to handle the discarded properly.