Electronic metronome, a must for playing musical instruments. A of rhythms are adjustable, and portable. The operation is simple, and shouts. Clear and clear, beautiful Precise rhythm device for piano, guitar and violin grading test Name:electronic-beat piano grading children's mini metronome Type:musical instrument accessories Weight:about 152g Colour:Blue Material:ABS+electronic components Size:14x7x4cm Package Contents: 1 * metronome 1 * USB cable 1 * Instructions Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.