From the manufacturer SUPER BRIGHT DISPLAY This digital LCD guitar tuner comes with a super clear LCD display. Adjustable ratchet mechanism and flexible screen allows for placement on front or back of headstock. The LCD Panel back-light illuminated. It has an automatic function of power off after 7 minutes. AUTOMATIC TUNER The Juarez tuner is completely automatic. It grants Accurate, Precise and Sensitive Tuning suitable for Acoustic guitar, Electric guitar, Classical guitar, 4-String Bass Guitar, Ukulele, Banjo, Violin, Viola, Violoncello, Cello, Mandolin, Trumpet, Saxophone, Flute, Brass and other Woodwind Instruments LCD PANEL DISPLAY The Juarez Automatic Tuner is featured with LCD panel display with Back-light illumination. The Super clear LCD display allows easy & effective visibility for better performance. AUTOMATIC POWER OFF Juarez Automatic tuner comes with Automatic power off feature. The illuminating light automatically turns off after 7 minutes when not in use. FAST & ACCURATE High sensitive vibration tuner responds fast, which ignores the background noise. It is ideal for loud, chaotic environment. 360 DEGREE EASY VIEW The large color display allows you to easily see at 360 degree angle, if you’re flat, sharp, or dead-on from any angle while playing the guitar. EASY TO USE CLIP ON Clip on mount with direct coupled vibration sensor for acoustic instruments. Just Turn it on, clip it on, and you’re ready to tune. The tuner detects the pitches directly from your instrument’s vibrations. Juarez GT-13 Digital LCD Guitar Bass Violin Ukulele Clip On Automatic Chromatic Tuner Features: Automatic Tuner with chromatic, guitar, bass, violin & ukulele functions. Clip-on mount with direct coupled vibration sensor for acoustic instruments. Back-light illuminated LCD Panel. Automatic power off after 7 minutes. Tuning Range : AO 27.50Hz ~ C8[4,186.00Hz] Accuracy : 0.5 cents Battery : 1 x CR2032 Coin Battery.