Accurate tuning: The Tune tuner features an extremely accurate piezoelectric sensor that detects instrument vibrations through direct contact and tunes instantly, without interference from ambient noise. A wide calibration range of 410 to 680 Hz ensures accurate performance. Easy to read: The high-resolution TFT screen (like your phone's) displays the tuning smoothly. The tuner can be used without problems in bright light (sunshine or on stage). All notes are clearly displayed on the screen. The screen display opens a new era of revolutionary tuning. Versatile: Equipped with two 360-degree swivel mechanisms on a clip, the tuner offers optimal viewing angles and maximum positioning flexibility. For left or right-handed instruments, whether small or large, it is ideal for acoustic and electric guitars, basses, mandolins, banjos, ukuleles and wind instruments. Rechargeable: Enjoy many hours of guitar tuning per charge without changing or buying batteries. Simply connect the included USB cable to a 5V USB power source when needed. AUTOMATIC SHUTDOWN - Ultra-low power consumption and an automatic shutdown function (no use after 3 minutes) save energy and extend battery life.