ACCURATE TO TUNE -tuner features an extremely accurate piezo transducer that detects the instrument's vibration via direct contact and accurately tunes in a flash without interference from ambient sound. A wide calibration range of 410-460Hz guarantees precise performance. EASY TO READ - The high definition TFT screen (like your phone) displays the tuning process smoothly. No worries to use the tuner under strong light from the sun or stage. All the notes flow into your screen clearly. The process of screen show brings you into a revolutionary era of tuning experience. VERSATILE TO USE - Featuring two 360-degree swivel mechanisms on a clamp, tuner offers optimal viewing angles and maximum positioning flexibility. For left or right-handed instruments with small or large headstocks, it is the ideal choice for acoustic and electric guitars, basses, mandolins, banjos, ukuleles and wind instruments. POWER RECHARGEABLE - Enjoy many hours of guitar tuning time per charge without changing or buying batteries. Simply plug the supplied USB cable into any 5V USB power source as needed. AUTOMATIC POWER OFF - Ultra low power consumption and auto-off function (no operation in 3 minutes) save energy and extend the life of the battery. Color: Black Material: plastic Package Contents: 1*Tuner Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.