Precise Tuning - The tuner features an extremely accurate piezoelectric sensor that detects the vibration of the instrument through direct contact and allows precise tuning in an instant without interference from ambient sound. A wide calibration range of 410-680Hz ensures precise performance. Easy to Read - The high-definition TFT screen, like your phone, displays the tuning process smoothly. No need to worry about using the tuner under the sun or the bright lights of the stage. All notes flow clearly into your screen. The on-screen display process will take you into a revolutionary new era of tuning experience. Versatile - The tuner is equipped with two 360-degree rotating mechanisms on the clip, which provides optimal viewing angle and maximum positioning flexibility. It is ideal for acoustic and electric guitars, bass, mandolin, banjo, ukulele, and wind instruments for left-handed or right-handed instruments with small or large headstocks. Rechargeable Power Supply - Enjoy hours of guitar tuning time after each charge without having to replace or purchase batteries. Simply plug the provided USB cable into any 5V USB power source as needed. Auto Power Off - Ultra-low power consumption and auto power off function (no operation within 3 minutes) saves energy and extends battery life.