This a small metronome that even with its small size produces a clear loud sound for convenientusage. With a builted in rechargeable battery, it can used for long durations and can rechargedusing the convenient USB adapter. Professional small digital metronome, universals for most instruments that need rhythm or tempos, easy to use. Clip & lanyard hole design for convenient carry and easy to fix. Package includes: 1Pc Small Electronic Metronome