Features: 1. Portable Wireless Bluetooth-Compatible Speaker Metronome USB Rechargeable Metronome for Correct the rhythm & Jesture of Playing pian 2. The human voice shouts and shoots, and the voice is loud enough: The voice broadcast reminds the rhythm at all times, breathtaking sound from a small speaker. 3. There can be built-in 20 common rhythms, free training speed, from slow to fast, from simple to complex, making it easier for students to master different rhythms. 4. Small and compact, it will fit in any bag or even coat pocket, plus carry it around with its easy to travel strap. 5. Designed by USB rechargeable, long service life Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Size: 85x35x85mm Connection: Bluetooth-Compatible Power supply mode: USB DC 5A-500MA