Didactic musical metronomes, have key-type selector connected with tempo switch, and metronome main body provided with digital display, speaker, headphone, on-off switch, power supply input part and battery box

摘要

The metronomes have keys touched with two wooden sticks and rhythmically colliding against each other. A key-type selector (2) is connected with a tempo switch (1). A metronome main body is provided with a digital display (5), a speaker (6), a headphone (7), an on-off switch (8), a power supply input part (9), a battery box (10) and a volume switch (3).