... 2.patented product,novel deisgn 3.metronome and practice drum, 2in1 4.long service life,has head phone Eno speed detection,tap counting and metronome 3 ... in 1 unique practice drumSpecification:Tempo range: 30~280bpmBeat: 0,1,2,3,4, ... headphones can be used to avoid interference. Eno speed detection,tap counting and metronome 3 in 1 unique practice drum