JOYO JM-60 Mini Portable Rechargeable Clip-on Electronic Digital Metronome Tone Generator Tuner for Guitar Violin Ukulele (White) 1. Mini size with clear loud sound for easy and convenient use. 2. Can be stood up using the back rest, clipped onto a music stand, or attached to your waist. 3. 12 accurate syllables for tone generator, 5 built-in tones. 4. Editable stored 9 parameters, fast switching with one button. 5. LCD screen displays working information; allows adjustment of tempo, beat, rhythm, prog, sound, and volume. 6. Built-in rechargeable lithium battery with USB adapter for long-lasting performance. 7. Metronome suitable for guitar, piano, violin, and other instruments to help improve rhythm. Specifications 1. Tone generator: C, C#, D, D#, E, F, F#, G, G#, A, A#, B 2. Battery: Built-in 4.2V lithium battery 3. Charging port: USB adapter 4. Item size: 4.5 x 4 x 0.8cm (1.8 x 1.6 x 0.3in) 5. Item weight: 20g (0.7oz) 6. Package List: 1 x Metronome 1 x USB cable 1 x Sling 1 x Clip 1 x User Manual