Features: Small and exquisite appearance, convenient to carry along. 360-degree rotatable design, to match your need better. With a clip, it is easy to fix on the instrument. Auto power off function, the device will turn off automatically if there is no signal present or operation in 3mins. It can be used for the tuning of guitar, chromatic, bass, violin, viola and ukulele. Specifications: Color: Black Turning items:Chromatic, guitar, bass, violin, viola, ukulele Tuning range: A0 – C8 Pitch range: 410-450HZ Power: 1 * CR2032 battery (not included) Precision: ±0.5 cent Display size: 3.2 * 2.3cm / 1.3 * 0.9in Product weight: 24g / 0.9oz Package size: 13.5 * 9.5 * 2cm / 5.3 * 3.7 * 0.8in Package weight: 39g / 1.4oz Note: Remove the battery if you don't use it for a long period Package Included: 1 * Electric tuner 1 * User manual (English & Chinese)