Rowin LT-21 Mini Clip Digital Tuner Dual Color Backlight LCD Clip On Tuner for Guitar Bass Violin Ukulele Chromatic Features: Mini Tuner: clip type backlight tuner, exquisitely crafted and elegant, very easy e. Tuning Items: G(Guitar), B(Bass), V(Violin), U(Ukulele), C(Chromatic). Professional Digital Tuner: A0(27.5Hz) - C8(4186.00Hz) tuning Range and 440Hz A4 frequency. Sensitive Tuning: simple pickup method, vibration pickup clamped on the instrument. Clear Display: color screen with white and green dual color backlight, screen can be rotated freely for the best viewing angle. Energy Saving: the tuner will be shut off automatically if no signals in 3 minutes. Specifications: Material: ABS Tuning Range: A0(27.5Hz) - C8(4186.00Hz) A4 Frequency: 440Hz Tuning Items: G(Guitar), B(Bass), V(Violin), U(Ukulele), C(Chromatic) Tolerance: 11 cent Battery: 1 * CR2032 button battery (Not included) Item Weight: 26g / 0.93oz Package Weight: 37g / 1.33oz Package Size: 9.2 * 4.6 * 4.2cm / 3.62 * 1.81 * 1.65in Package List: 1 * Tuner 1 * Manual (English)