Feature: 1. This is a clip on tuner suitable for halftone / guitar / bass / ukulele / violin 2. Equipped with built‑in battery, you can also easily connect and charge with the attached USB power cord 3. Adopt high definition 4 color VA screen, which is bright and clear, easy for you to read 4. Double 360 degree rotatable clip provides the best viewing angle for you, very flexible 5. This 12 equal temperament universal tuner bring ultra fast, accurate tuning performance Specification: Item Type: Guitar Clip-on Tuner Proofreading Items: 12 Average temperament, guitar, bass, violin, ukulele Cent Frequency Indication: - 50 + 50 Cent A4 Frequency: 430Hz-450Hz Accuracy: ±0.5 Cent Battery: 3.7V built-in lithium battery 110mah Charging Time: 2.5 Hours (from 0 to 100%) Duration: 5 Hours (continuous use) Charging Times: 500 Times (after full discharge) Charging Method: 5V USB charging cord is connected with mobile phone adapter, computer and mobile power supply (18V fast charging is not supported) Package List: 1 x Tuner 1 x USB Cable 1 x User Manual