Features: 1.This is a mini 360 rotatable tuner that can be adjusted to an appropriate angle, simple and practical. 2.With a wide range of applications and can be used for tuning of guitar, chromatic, bass, violin and ukulele. 3.The LCD digital display screen can provide you with a clearer viewing experience from any angle. 4.Small in size, can be easily carried in the instrument case or bag, convenient to use. 5.Fix the clip of the tuner to the instrument, adjust the angle of the display to a position that is easy to observe, and adjust it as needed.specification:Item Type: Clip?On Tuner Scope of Application: Guitar/bass violin/Ukulele twelve equal temperament A4 Frequency: 430~450HZ Pickup Range: AO (27.5HZ)-A3 (1760HZ) Battery Type: 1 x button battery (CR2032) (without battery) Product Size: Approx. 48 x 35 x 42mm/1.9 x 1.4 x 1.7in How to Use: 1. Tap the power button on the right to select the tuning item; 2. Tap the A4 button on the right to adjust the frequency of A4; 3. Long press the power button on the right side for 2 seconds to turn on/off; 4. Long press the A4 button on the right side for 2 seconds to quickly select the frequency.PackageList:1 x Tuner1 x Chinese and English User Manual