Guitar Clip-On Tuner, Equipped With Built-In Battery Double 360 Degree Rotatable Clip Durable Not Easy To Damage Violin Tuner, for Guitar Bass Specification: Item Type: Guitar Clip-on TunerProofreading 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