Rechargeable Clip-On Guitar Tuner with Built-in Battery, USB Cable, Compact, Great also for Ukulele, Banjo, Mandolin, Chromatic Tuning with Vibration Sensor, Out of Sight Behind Headstock BUILT-IN RECHARGEABLE BATTERY - No need for batteries, USB cable included for easy charging from PC ROBUST, COMPACT DESIGN - Easy-to-read LCD display, green means guitar in tune, white out of tune PRECISE - Fast response. Guitar Tuning range: A0 (27.5Hz)-C8 (4186Hz); tuner 360 angle rotation 4 TUNER MODES: Mode Button for Chromatic, Guitar, Bass, Ukulele. Tuning Violin, Banjo, Mandolin. Display behind headstock DETAILED VIDEO INSTRUCTIONS - available on aether tuner site, showing use of the tuner's functions