From the manufacturer
The Tecnix Guitar tuner will take the pain out of getting your Instrument in tune! I Perfect for beginners and designed to make your life easy, you will wonder how you survived without it. Featuring color based turning to visually let you know when your Instrument has hit the perfect frequency and easy to set up design! Can be used on a Guitar, Bass Guitar, Ukulele, Banjo and Violin.
Features: - Instruments: Guitar, Bass, Ukulele, Banjo, Violin - Power: 3V Lithium Battery (CR2032) - Display: Color Changing LCD - Detection Mode: Clip - A4 Calibration: 440Hz