Guitar Tuner - Acoustic, Bass, Electric - Also Works With Ukulele & Violin - Clip On Style; Standard & Chromatic Tuning Electronic guitar tuner clips on headstock; reads string vibration so room noise does NOT affect tuning. Strong clip ensures high sensitivity vibration for accurate tuning clip. Quality workmanship ensures clip won't break off guitar tuner Easy-to-read screen in all lighting environments + screen changes from blue to green when in tune for even easier reading by beginners Easy open battery compartment; no tools required. Slip battery UNDER metal tab & pop cover back on. Youre ready to tune! 3 Year No Hassle Guarantee. We'll Replace It; No Questions Asked